diff --git a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004296092/epc.json b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004296092/epc.json
new file mode 100644
index 000000000..93fe00f70
--- /dev/null
+++ b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004296092/epc.json
@@ -0,0 +1,361 @@
+{
+  "uprn": 200004296092,
+  "roofs": [
+    {
+      "description": "Pitched, 150 mm loft insulation",
+      "energy_efficiency_rating": 4,
+      "environmental_efficiency_rating": 4
+    }
+  ],
+  "walls": [
+    {
+      "description": "Solid brick, with external insulation",
+      "energy_efficiency_rating": 4,
+      "environmental_efficiency_rating": 4
+    }
+  ],
+  "floors": [
+    {
+      "description": "Solid, no insulation (assumed)",
+      "energy_efficiency_rating": 0,
+      "environmental_efficiency_rating": 0
+    }
+  ],
+  "status": "entered",
+  "tenure": 1,
+  "window": {
+    "description": "Fully double glazed",
+    "energy_efficiency_rating": 3,
+    "environmental_efficiency_rating": 3
+  },
+  "lighting": {
+    "description": "Excellent lighting efficiency",
+    "energy_efficiency_rating": 5,
+    "environmental_efficiency_rating": 5
+  },
+  "postcode": "LL16 3RL",
+  "hot_water": {
+    "description": "From main system",
+    "energy_efficiency_rating": 4,
+    "environmental_efficiency_rating": 4
+  },
+  "post_town": "DENBIGH",
+  "psv_count": 0,
+  "built_form": 3,
+  "created_at": "2026-05-14 14:33:05",
+  "door_count": 2,
+  "region_code": 7,
+  "report_type": 2,
+  "sap_heating": {
+    "number_baths": 0,
+    "cylinder_size": 1,
+    "shower_outlets": [
+      {
+        "shower_wwhrs": 1,
+        "shower_outlet_type": 2
+      }
+    ],
+    "number_baths_wwhrs": 0,
+    "water_heating_code": 901,
+    "water_heating_fuel": 26,
+    "main_heating_details": [
+      {
+        "has_fghrs": "N",
+        "main_fuel_type": 26,
+        "boiler_flue_type": 2,
+        "fan_flue_present": "Y",
+        "heat_emitter_type": 1,
+        "emitter_temperature": 1,
+        "main_heating_number": 1,
+        "main_heating_control": 2106,
+        "main_heating_category": 2,
+        "main_heating_fraction": 1,
+        "central_heating_pump_age": 0,
+        "main_heating_data_source": 1,
+        "main_heating_index_number": 16137
+      }
+    ],
+    "immersion_heating_type": "NA",
+    "has_fixed_air_conditioning": "false"
+  },
+  "sap_version": 10.2,
+  "sap_windows": [
+    {
+      "pvc_frame": "true",
+      "orientation": 5,
+      "window_type": 1,
+      "glazing_type": 2,
+      "window_width": {
+        "value": 1.07,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 1.34,
+        "quantity": "m"
+      },
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "orientation": 5,
+      "window_type": 1,
+      "glazing_type": 2,
+      "window_width": {
+        "value": 1.07,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 1.34,
+        "quantity": "m"
+      },
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "orientation": 1,
+      "window_type": 1,
+      "glazing_type": 2,
+      "window_width": {
+        "value": 0.47,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 0.85,
+        "quantity": "m"
+      },
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "orientation": 1,
+      "window_type": 1,
+      "glazing_type": 2,
+      "window_width": {
+        "value": 0.47,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 0.85,
+        "quantity": "m"
+      },
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "orientation": 1,
+      "window_type": 1,
+      "glazing_type": 2,
+      "window_width": {
+        "value": 0.76,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 0.84,
+        "quantity": "m"
+      },
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    }
+  ],
+  "schema_type": "RdSAP-Schema-21.0.1",
+  "uprn_source": "Energy Assessor",
+  "country_code": "WLS",
+  "main_heating": [
+    {
+      "description": "Boiler and radiators, mains gas",
+      "energy_efficiency_rating": 4,
+      "environmental_efficiency_rating": 4
+    }
+  ],
+  "air_tightness": {
+    "description": "(not tested)",
+    "energy_efficiency_rating": 0,
+    "environmental_efficiency_rating": 0
+  },
+  "dwelling_type": "End-terrace house",
+  "language_code": 1,
+  "pressure_test": 4,
+  "property_type": 0,
+  "address_line_1": "54 Myddleton Avenue",
+  "assessment_type": "RdSAP",
+  "completion_date": "2026-05-14",
+  "inspection_date": "2026-05-14",
+  "extensions_count": 0,
+  "measurement_type": 1,
+  "open_flues_count": 0,
+  "total_floor_area": 62,
+  "transaction_type": 1,
+  "conservatory_type": 1,
+  "heated_room_count": 3,
+  "other_flues_count": 0,
+  "registration_date": "2026-05-14",
+  "sap_energy_source": {
+    "mains_gas": "Y",
+    "meter_type": 2,
+    "pv_connection": 0,
+    "photovoltaic_supply": {
+      "none_or_no_details": {
+        "percent_roof_area": 0
+      }
+    },
+    "wind_turbines_count": 0,
+    "gas_smart_meter_present": "true",
+    "is_dwelling_export_capable": "false",
+    "wind_turbines_terrain_type": 2,
+    "electricity_smart_meter_present": "true"
+  },
+  "secondary_heating": {
+    "description": "None",
+    "energy_efficiency_rating": 0,
+    "environmental_efficiency_rating": 0
+  },
+  "closed_flues_count": 0,
+  "extract_fans_count": 0,
+  "sap_building_parts": [
+    {
+      "identifier": "Main Dwelling",
+      "wall_dry_lined": "N",
+      "wall_thickness": 360,
+      "floor_heat_loss": 7,
+      "roof_construction": 4,
+      "wall_construction": 3,
+      "building_part_number": 1,
+      "sap_floor_dimensions": [
+        {
+          "floor": 0,
+          "room_height": 2.4,
+          "floor_insulation": 1,
+          "total_floor_area": 31.16,
+          "party_wall_length": 6.79,
+          "floor_construction": 1,
+          "heat_loss_perimeter": 15.97
+        },
+        {
+          "floor": 1,
+          "room_height": 2.4,
+          "total_floor_area": 31.16,
+          "party_wall_length": 6.79,
+          "heat_loss_perimeter": 15.97
+        }
+      ],
+      "wall_insulation_type": 1,
+      "construction_age_band": "B",
+      "party_wall_construction": 0,
+      "wall_thickness_measured": "Y",
+      "roof_insulation_location": 2,
+      "roof_insulation_thickness": "150mm",
+      "wall_insulation_thickness": "NI"
+    }
+  ],
+  "boilers_flues_count": 0,
+  "open_chimneys_count": 0,
+  "solar_water_heating": "N",
+  "habitable_room_count": 3,
+  "heating_cost_current": {
+    "value": 589,
+    "currency": "GBP"
+  },
+  "insulated_door_count": 0,
+  "co2_emissions_current": 1.8,
+  "energy_rating_average": 60,
+  "energy_rating_current": 71,
+  "lighting_cost_current": {
+    "value": 50,
+    "currency": "GBP"
+  },
+  "main_heating_controls": [
+    {
+      "description": "Programmer, room thermostat and TRVs",
+      "energy_efficiency_rating": 4,
+      "environmental_efficiency_rating": 4
+    }
+  ],
+  "blocked_chimneys_count": 0,
+  "has_hot_water_cylinder": "false",
+  "heating_cost_potential": {
+    "value": 543,
+    "currency": "GBP"
+  },
+  "hot_water_cost_current": {
+    "value": 275,
+    "currency": "GBP"
+  },
+  "mechanical_ventilation": 0,
+  "percent_draughtproofed": 100,
+  "schema_version_current": "LIG-21.0",
+  "suggested_improvements": [
+    {
+      "sequence": 1,
+      "typical_saving": 47,
+      "indicative_cost": "\u00a35,000 - \u00a310,000",
+      "improvement_type": "W2",
+      "improvement_details": {
+        "improvement_number": 58
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 72,
+      "environmental_impact_rating": 79
+    },
+    {
+      "sequence": 2,
+      "typical_saving": 275,
+      "indicative_cost": "\u00a38,000 - \u00a310,000",
+      "improvement_type": "U",
+      "improvement_details": {
+        "improvement_number": 34
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 84,
+      "environmental_impact_rating": 81
+    }
+  ],
+  "co2_emissions_potential": 1.4,
+  "energy_rating_potential": 84,
+  "lighting_cost_potential": {
+    "value": 50,
+    "currency": "GBP"
+  },
+  "schema_version_original": "LIG-21.0",
+  "hot_water_cost_potential": {
+    "value": 275,
+    "currency": "GBP"
+  },
+  "renewable_heat_incentive": {
+    "water_heating": 1768.31,
+    "space_heating_existing_dwelling": 5933.75
+  },
+  "draughtproofed_door_count": 2,
+  "energy_consumption_current": 169,
+  "has_fixed_air_conditioning": "false",
+  "multiple_glazed_proportion": 100,
+  "calculation_software_version": "10.2.2.0",
+  "energy_consumption_potential": 130,
+  "environmental_impact_current": 77,
+  "cfl_fixed_lighting_bulbs_count": 0,
+  "current_energy_efficiency_band": "C",
+  "environmental_impact_potential": 81,
+  "led_fixed_lighting_bulbs_count": 12,
+  "has_heated_separate_conservatory": "false",
+  "potential_energy_efficiency_band": "B",
+  "co2_emissions_current_per_floor_area": 29,
+  "incandescent_fixed_lighting_bulbs_count": 0
+}
\ No newline at end of file
diff --git a/domain/sap10_ml/rdsap_uvalues.py b/domain/sap10_ml/rdsap_uvalues.py
index 9b7a8c509..0d2246394 100644
--- a/domain/sap10_ml/rdsap_uvalues.py
+++ b/domain/sap10_ml/rdsap_uvalues.py
@@ -157,6 +157,11 @@ _WALL_INSULATION_INTERNAL: Final[int] = 3
 WALL_INSULATION_CAVITY_PLUS_EXTERNAL: Final[int] = 6
 WALL_INSULATION_CAVITY_PLUS_INTERNAL: Final[int] = 7
 
+# RdSAP 10 §5.4 (PDF p.32): "assume 100 mm if thickness is unknown" — the
+# default added-insulation thickness for an External / Internal wall
+# insulation lodgement (type 1/3) with no measured thickness.
+_WALL_ADDED_INSULATION_UNKNOWN_THICKNESS_MM: Final[int] = 100
+
 # RdSAP 10 §4-6 (page 73): default thermal conductivity of insulation when
 # no documentary evidence is available. Used to convert the lodged
 # `wall_insulation_thickness` (mm) into thermal resistance (m²K/W) via
@@ -589,6 +594,28 @@ def u_wall(
     ctry = country if country is not None else Country.ENG
     age_idx = _age_index(age_band)
     band = _AGE_BANDS[age_idx]
+    # RdSAP 10 §5.4 (PDF p.32): "the U-value with additional insulation is
+    # based on the thickness of insulation of mineral wool type (assume
+    # 100 mm if thickness is unknown)". A SOLID-BRICK or STONE wall lodging
+    # External or Internal insulation (wall_insulation_type 1/3) but no
+    # measured insulation thickness (gov-API "NI" → None) takes the 100 mm
+    # default so the §5.8 Table-14 R-value adjustment (brick/stone branches
+    # below) fires instead of billing the wall at its uninsulated
+    # §5.6/Table-6 U (over-counting fabric loss → under-rate; corpus cert
+    # 200004296092, solid brick 360 mm, walls 101.7 W/K → PE +59.6). Scoped
+    # to brick/stone because only those constructions have a §5.8 added-
+    # insulation R-value path here — cavity uses the separate
+    # `WALL_INSULATION_CAVITY_PLUS_*` composite, and timber/system-built
+    # carry no §5.8 branch, so a thickness default there would be inert or
+    # mis-routed.
+    if (
+        construction
+        in (WALL_STONE_GRANITE, WALL_STONE_SANDSTONE, WALL_SOLID_BRICK)
+        and wall_insulation_type
+        in (_WALL_INSULATION_EXTERNAL, _WALL_INSULATION_INTERNAL)
+        and (insulation_thickness_mm is None or insulation_thickness_mm == 0)
+    ):
+        insulation_thickness_mm = _WALL_ADDED_INSULATION_UNKNOWN_THICKNESS_MM
     # RdSAP 10 Tables 6-10 stone rows + footnote (a) (PDF p.33-39), §5.6
     # formula (PDF p.40), §5.8 + Table 14 (PDF p.41-42). A documentary wall
     # thickness (per §5.3) routes stone in age bands A-E off the §5.6 formula,
diff --git a/domain/sap10_ml/tests/test_rdsap_uvalues.py b/domain/sap10_ml/tests/test_rdsap_uvalues.py
index e6019befa..f7067759c 100644
--- a/domain/sap10_ml/tests/test_rdsap_uvalues.py
+++ b/domain/sap10_ml/tests/test_rdsap_uvalues.py
@@ -835,6 +835,34 @@ def test_u_wall_stone_granite_with_external_insulation_applies_5_8_table_14_r_va
     assert abs(result - 0.57) <= 1e-4
 
 
+def test_u_wall_solid_brick_external_insulation_unknown_thickness_assumes_100mm() -> None:
+    # Arrange — RdSAP 10 §5.4 (PDF p.32): "the U-value with additional
+    # insulation is based on the thickness of insulation of mineral wool
+    # type (assume 100 mm if thickness is unknown)". A solid brick / stone
+    # wall lodging External or Internal insulation (wall_insulation_type
+    # 1/3) but NO measured insulation thickness (gov-API "NI" → parsed to
+    # None) must take the 100 mm §5.4 default so the §5.8 Table-14 R-value
+    # fires — NOT fall through to the uninsulated §5.6 U. Corpus cert
+    # 200004296092 (age-B solid brick 360 mm, "with external insulation",
+    # thickness NI) was billed at the uninsulated 1.40 (walls 101.7 W/K,
+    # HLP 3.46) → PE +59.6, SAP −6.65. With 100 mm: U₀(§5.6, 360 mm brick)
+    # + R(100 mm, λ=0.04 → 2.5) → 0.29.
+
+    # Act
+    result = u_wall(
+        country=Country.ENG,
+        age_band="B",
+        construction=WALL_SOLID_BRICK,
+        insulation_thickness_mm=None,  # gov-API "NI" — thickness unknown
+        insulation_present=True,
+        wall_insulation_type=1,  # External
+        wall_thickness_mm=360,
+    )
+
+    # Assert — 100 mm default applied, not the uninsulated 1.40.
+    assert abs(result - 0.29) <= 1e-4
+
+
 def test_u_wall_stone_granite_age_g_with_wall_thickness_ignores_5_6_formula_per_age_a_to_e_gate() -> None:
     # Arrange — §5.6 (PDF p.40) heading explicitly scopes the formula
     # to "age bands A to E". For age F onwards Table 6 gives literal
diff --git a/scripts/corpus_1000/worklist.md b/scripts/corpus_1000/worklist.md
index 4f8a9a5dd..07c3cccf3 100644
--- a/scripts/corpus_1000/worklist.md
+++ b/scripts/corpus_1000/worklist.md
@@ -1,6 +1,6 @@
 # RdSAP-21.0.1 corpus campaign ledger
 
-**Gauge:** 1000 computed / 0 skipped · SAP within-0.5 = **77.0%** · MAE = **0.658** (floors in test_sap_accuracy_corpus.py)
+**Gauge:** 1000 computed / 0 skipped · SAP within-0.5 = **77.0%** · MAE = **0.647** (floors in test_sap_accuracy_corpus.py)
 
 Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail engine bug · ⛔ unbuildable. Line: `uprn · lodged L / eng E / Δ · signature`. Rebuild/re-rank: `PYTHONPATH=. python scripts/corpus_1000/build_worklist.py` (preserves statuses & `<-` notes).
 
@@ -42,584 +42,584 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 ### C011 · Σ|Δ| 6.7 · 1 certs · `h691/elec | solid brick | pitched 100 | RR,ext1,whw909`
 - [ ] `100032223878` · L 11 / E 17.67 / Δ +6.67
 
-### C012 · Σ|Δ| 6.6 · 1 certs · `hpcdb16137/gas | solid brick | pitched 150`
-- [ ] `200004296092` · L 71 / E 64.35 / Δ -6.65
-
-### C013 · Σ|Δ| 6.5 · 1 certs · `h408/elec | granite or | (another dwelling | sec:portable electric,whw903`
+### C012 · Σ|Δ| 6.5 · 1 certs · `h408/elec | granite or | (another dwelling | sec:portable electric,whw903`
 - [ ] `100121397382` · L 69 / E 75.49 / Δ +6.49
 
-### C014 · Σ|Δ| 6.5 · 1 certs · `h691/elec | solid brick | (another dwelling | ext1,sec:room heaters,whw903`
+### C013 · Σ|Δ| 6.5 · 1 certs · `h691/elec | solid brick | (another dwelling | ext1,sec:room heaters,whw903`
 - [ ] `100062100640` · L 54 / E 47.51 / Δ -6.49
 
-### C015 · Σ|Δ| 6.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 225`
+### C014 · Σ|Δ| 6.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 225`
 - [ ] `100050844968` · L 71 / E 65.02 / Δ -5.98
 
-### C016 · Σ|Δ| 5.8 · 1 certs · `hpcdb17777/gas+2mains | cavity wall | pitched insulated | ext1,sec:room heaters,whw914`
+### C015 · Σ|Δ| 5.8 · 1 certs · `hpcdb17777/gas+2mains | cavity wall | pitched insulated | ext1,sec:room heaters,whw914`
 - [ ] `line804` · L 52 / E 57.76 / Δ +5.76
 
-### C017 · Σ|Δ| 5.7 · 1 certs · `hpcdb17507/gas | solid brick | pitched 150 | ext1,mv2`
-- [ ] `200049463` · L 69 / E 63.28 / Δ -5.72
-
-### C018 · Σ|Δ| 5.6 · 2 certs · `h402/elec | solid brick | (another dwelling | sec:portable electric,whw903`
+### C016 · Σ|Δ| 5.6 · 2 certs · `h402/elec | solid brick | (another dwelling | sec:portable electric,whw903`
 - [ ] `11071248` · L 78 / E 81.86 / Δ +3.86
 - [ ] `12126160` · L 69 / E 70.71 / Δ +1.71
 
-### C019 · Σ|Δ| 4.6 · 1 certs · `hpcdb18560/gas | solid brick | pitched no | RR`
+### C017 · Σ|Δ| 4.6 · 1 certs · `hpcdb18560/gas | solid brick | pitched no | RR`
 - [ ] `100051233481` · L 65 / E 69.64 / Δ +4.64
 
-### C020 · Σ|Δ| 4.5 · 1 certs · `h691/elec | timber frame | pitched limited | RR,ext2,whw903`
+### C018 · Σ|Δ| 4.5 · 1 certs · `h691/elec | timber frame | pitched limited | RR,ext2,whw903`
 - [ ] `100061646773` · L 68 / E 63.46 / Δ -4.54
 
-### C021 · Σ|Δ| 4.5 · 1 certs · `hpcdb18786/fuel27 | solid brick | pitched 100 | RR,consv3`
+### C019 · Σ|Δ| 4.5 · 1 certs · `hpcdb18786/fuel27 | solid brick | pitched 100 | RR,consv3`
 - [ ] `100071010014` · L 55 / E 50.47 / Δ -4.53
 
-### C022 · Σ|Δ| 4.5 · 1 certs · `hpcdb17815/gas | cavity wall | flat insulated`
+### C020 · Σ|Δ| 4.5 · 1 certs · `hpcdb17815/gas | cavity wall | flat insulated`
 - [ ] `47084930` · L 74 / E 69.51 / Δ -4.49
 
-### C023 · Σ|Δ| 4.5 · 1 certs · `h301/coal-anth | system built | (another dwelling | mv4`
+### C021 · Σ|Δ| 4.5 · 1 certs · `h301/coal-anth | system built | (another dwelling | mv4`
 - [ ] `10093342182` · L 82 / E 77.51 / Δ -4.49
 
-### C024 · Σ|Δ| 4.4 · 1 certs · `hpcdb17973/gas | solid brick | (another dwelling`
+### C022 · Σ|Δ| 4.4 · 1 certs · `hpcdb17973/gas | solid brick | (another dwelling`
 - [ ] `5117280` · L 76 / E 71.56 / Δ -4.44
 
-### C025 · Σ|Δ| 4.4 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2`
+### C023 · Σ|Δ| 4.4 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2`
 - [ ] `217060420` · L 42 / E 37.58 / Δ -4.42
 
-### C026 · Σ|Δ| 4.4 · 1 certs · `h402/elec | cavity wall | (another dwelling | sec:room heaters,whw903`
+### C024 · Σ|Δ| 4.4 · 1 certs · `h402/elec | cavity wall | (another dwelling | sec:room heaters,whw903`
 - [ ] `72399971` · L 69 / E 64.60 / Δ -4.40
 
-### C027 · Σ|Δ| 4.4 · 1 certs · `hpcdb19258/fuel28 | granite or | pitched no | ext2,sec:room heaters`
+### C025 · Σ|Δ| 4.4 · 1 certs · `hpcdb19258/fuel28 | granite or | pitched no | ext2,sec:room heaters`
 - [ ] `10007016314` · L 57 / E 52.64 / Δ -4.36
 
-### C028 · Σ|Δ| 4.1 · 1 certs · `h633/heatnet | sandstone with | pitched insulated | sec:room heaters,whw903`
+### C026 · Σ|Δ| 4.1 · 1 certs · `h633/heatnet | sandstone with | pitched insulated | sec:room heaters,whw903`
 - [ ] `100052159386` · L 56 / E 51.92 / Δ -4.08
 
-### C029 · Σ|Δ| 4.0 · 1 certs · `h191/elec | cavity wall | (another dwelling`
+### C027 · Σ|Δ| 4.0 · 1 certs · `h191/elec | cavity wall | (another dwelling`
 - [ ] `10002272664` · L 79 / E 74.96 / Δ -4.04
 
-### C030 · Σ|Δ| 4.0 · 1 certs · `h408/elec | cavity wall | pitched 100 | ext1,sec:room heaters,whw903`
+### C028 · Σ|Δ| 4.0 · 1 certs · `h408/elec | cavity wall | pitched 100 | ext1,sec:room heaters,whw903`
 - [ ] `100040767294` · L 43 / E 47.04 / Δ +4.04
 
-### C031 · Σ|Δ| 3.6 · 1 certs · `hpcdb15445/gas | granite or | pitched no | RR,ext3,sec:room heaters`
+### C029 · Σ|Δ| 3.6 · 1 certs · `hpcdb15445/gas | granite or | pitched no | RR,ext3,sec:room heaters`
 - [ ] `10002188054` · L 68 / E 64.42 / Δ -3.58
 
-### C032 · Σ|Δ| 3.5 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | PV,ext2,sec:room heaters`
+### C030 · Σ|Δ| 3.5 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | PV,ext2,sec:room heaters`
 - [ ] `39066537` · L 78 / E 81.49 / Δ +3.49
 
-### C033 · Σ|Δ| 3.5 · 1 certs · `hpcdb8387/gas | cavity wall | pitched 150`
+### C031 · Σ|Δ| 3.5 · 1 certs · `hpcdb8387/gas | cavity wall | pitched 150`
 - [ ] `100100137438` · L 69 / E 72.48 / Δ +3.48
 
-### C034 · Σ|Δ| 3.4 · 1 certs · `hpcdb17507/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C032 · Σ|Δ| 3.4 · 1 certs · `hpcdb17507/gas | cavity wall | pitched insulated | RR,sec:room heaters`
 - [ ] `100080122910` · L 60 / E 63.45 / Δ +3.45
 
-### C035 · Σ|Δ| 3.3 · 1 certs · `h691/elec | cavity wall | pitched 300 | mv5,sec:portable electric,whw903`
+### C033 · Σ|Δ| 3.3 · 1 certs · `h691/elec | cavity wall | pitched 300 | mv5,sec:portable electric,whw903`
 - [ ] `452010022` · L 42 / E 38.67 / Δ -3.33
 
-### C036 · Σ|Δ| 3.3 · 1 certs · `h402/elec | cavity wall | pitched 150 | ext1,sec:room heaters,whw903`
+### C034 · Σ|Δ| 3.3 · 1 certs · `h402/elec | cavity wall | pitched 150 | ext1,sec:room heaters,whw903`
 - [ ] `200004818752` · L 34 / E 30.73 / Δ -3.27
 
-### C037 · Σ|Δ| 3.2 · 1 certs · `hpcdb18759/gas | sandstone as | pitched insulated | RR,ext1,sec:room heaters`
+### C035 · Σ|Δ| 3.2 · 1 certs · `hpcdb18759/gas | sandstone as | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `72351021` · L 64 / E 60.85 / Δ -3.15
 
-### C038 · Σ|Δ| 3.1 · 1 certs · `h633/heatnet | timber frame | roof room(s) | RR,ext1,sec:room heaters,whw909`
+### C036 · Σ|Δ| 3.1 · 1 certs · `h633/heatnet | timber frame | roof room(s) | RR,ext1,sec:room heaters,whw909`
 - [ ] `22077224` · L 37 / E 33.90 / Δ -3.10
 
-### C039 · Σ|Δ| 3.0 · 1 certs · `hpcdb18498/gas | solid brick | pitched 250 | RR,ext2`
+### C037 · Σ|Δ| 3.0 · 1 certs · `hpcdb18498/gas | solid brick | pitched 250 | RR,ext2`
 - [ ] `10011740578` · L 70 / E 67.00 / Δ -3.00
 
-### C040 · Σ|Δ| 2.9 · 1 certs · `h402/elec | cavity wall | pitched 250 | sec:portable electric,whw903`
+### C038 · Σ|Δ| 2.9 · 1 certs · `h402/elec | cavity wall | pitched 250 | sec:portable electric,whw903`
 - [ ] `100110680822` · L 79 / E 76.07 / Δ -2.93
 
-### C041 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | solid brick | pitched 250`
+### C039 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | solid brick | pitched 250`
 - [ ] `452032915` · L 75 / E 72.09 / Δ -2.91
 
-### C042 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | cavity wall | (another dwelling | whw909`
+### C040 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | cavity wall | (another dwelling | whw909`
 - [ ] `100071306639` · L 73 / E 70.14 / Δ -2.86
 
-### C043 · Σ|Δ| 2.9 · 1 certs · `hpcdb18435/gas+2mains | cavity wall | pitched 100 | ext3,sec:room heaters,whw903`
+### C041 · Σ|Δ| 2.9 · 1 certs · `hpcdb18435/gas+2mains | cavity wall | pitched 100 | ext3,sec:room heaters,whw903`
 - [ ] `100061346049` · L 55 / E 52.15 / Δ -2.85
 
-### C044 · Σ|Δ| 2.7 · 1 certs · `hpcdb8443/fuel28 | cavity wall | pitched 100 | RR,ext2,sec:room heaters`
+### C042 · Σ|Δ| 2.7 · 1 certs · `hpcdb8443/fuel28 | cavity wall | pitched 100 | RR,ext2,sec:room heaters`
 - [ ] `10013008238` · L 41 / E 38.26 / Δ -2.74
 
-### C045 · Σ|Δ| 2.7 · 3 certs · `h691/elec | cavity wall | (another dwelling | whw903`
+### C043 · Σ|Δ| 2.7 · 3 certs · `h691/elec | cavity wall | (another dwelling | whw903`
 - [ ] `10033187652` · L 70 / E 71.21 / Δ +1.21
 - [ ] `200002730` · L 65 / E 64.13 / Δ -0.87
 - [ ] `10023328117` · L 78 / E 78.64 / Δ +0.64
 
-### C046 · Σ|Δ| 2.7 · 1 certs · `h633/heatnet | cavity wall | pitched 200 | RR,sec:room heaters,whw903`
+### C044 · Σ|Δ| 2.7 · 1 certs · `h633/heatnet | cavity wall | pitched 200 | RR,sec:room heaters,whw903`
 - [ ] `10004873253` · L 65 / E 62.29 / Δ -2.71
 
-### C047 · Σ|Δ| 2.7 · 1 certs · `h691/elec | cavity wall | (another dwelling | mv1,whw903`
+### C045 · Σ|Δ| 2.7 · 1 certs · `h691/elec | cavity wall | (another dwelling | mv1,whw903`
 - [ ] `10090793715` · L 73 / E 75.71 / Δ +2.71
 
-### C048 · Σ|Δ| 2.7 · 1 certs · `hpcdb17964/gas+2mains | cavity wall | pitched 100 | ext1,sec:room heaters`
+### C046 · Σ|Δ| 2.7 · 1 certs · `hpcdb17964/gas+2mains | cavity wall | pitched 100 | ext1,sec:room heaters`
 - [ ] `100120745600` · L 65 / E 67.69 / Δ +2.69
 
-### C049 · Σ|Δ| 2.7 · 1 certs · `hpcdb17757/gas | granite or | pitched no | RR,ext1`
+### C047 · Σ|Δ| 2.7 · 1 certs · `hpcdb17757/gas | granite or | pitched no | RR,ext1`
 - [ ] `100051178830` · L 63 / E 65.66 / Δ +2.66
 
-### C050 · Σ|Δ| 2.6 · 1 certs · `hpcdb10321/gas | sandstone as | pitched 100 | ext2`
+### C048 · Σ|Δ| 2.6 · 1 certs · `hpcdb10321/gas | sandstone as | pitched 100 | ext2`
 - [ ] `100120018282` · L 64 / E 61.36 / Δ -2.64
 
-### C051 · Σ|Δ| 2.6 · 1 certs · `hpcdb17968/gas | cavity wall | pitched 300 | ext2,sec:room heaters`
+### C049 · Σ|Δ| 2.6 · 1 certs · `hpcdb17968/gas | cavity wall | pitched 300 | ext2,sec:room heaters`
 - [ ] `83035979` · L 65 / E 67.60 / Δ +2.60
 
-### C052 · Σ|Δ| 2.5 · 1 certs · `h524/elec | solid brick | (another dwelling | consv2,sec:room heaters,whw909`
+### C050 · Σ|Δ| 2.5 · 1 certs · `h524/elec | solid brick | (another dwelling | consv2,sec:room heaters,whw909`
 - [ ] `10014073761` · L 75 / E 72.52 / Δ -2.48
 
-### C053 · Σ|Δ| 2.5 · 1 certs · `hpcdb10328/gas | solid brick | pitched insulated | RR`
+### C051 · Σ|Δ| 2.5 · 1 certs · `hpcdb10328/gas | solid brick | pitched insulated | RR`
 - [ ] `100050964834` · L 60 / E 62.47 / Δ +2.47
 
-### C054 · Σ|Δ| 2.4 · 1 certs · `h694/elec | cavity wall | (another dwelling | whw941`
+### C052 · Σ|Δ| 2.4 · 1 certs · `h694/elec | cavity wall | (another dwelling | whw941`
 - [ ] `100120752995` · L 71 / E 73.42 / Δ +2.42
 
-### C055 · Σ|Δ| 2.4 · 1 certs · `hpcdb1245/gas | solid brick | pitched insulated | ext1`
+### C053 · Σ|Δ| 2.4 · 1 certs · `hpcdb1245/gas | solid brick | pitched insulated | ext1`
 - [ ] `100032230128` · L 55 / E 52.60 / Δ -2.40
 
-### C056 · Σ|Δ| 2.3 · 1 certs · `hpcdb15753/gas | solid brick | pitched 150 | RR`
+### C054 · Σ|Δ| 2.3 · 1 certs · `hpcdb15753/gas | solid brick | pitched 150 | RR`
 - [ ] `100000034023` · L 73 / E 70.71 / Δ -2.29
 
-### C057 · Σ|Δ| 2.2 · 1 certs · `h506/gas | cavity wall | flat limited | sec:room heaters`
+### C055 · Σ|Δ| 2.2 · 1 certs · `h506/gas | cavity wall | flat limited | sec:room heaters`
 - [ ] `100020377671` · L 62 / E 64.23 / Δ +2.23
 
-### C058 · Σ|Δ| 2.2 · 1 certs · `h104/gas | solid brick | pitched insulated | RR,ext1`
+### C056 · Σ|Δ| 2.2 · 1 certs · `h104/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `22027335` · L 76 / E 73.77 / Δ -2.23
 
-### C059 · Σ|Δ| 2.2 · 1 certs · `h408/elec+2mains | sandstone as | (another dwelling | sec:room heaters,whw903`
+### C057 · Σ|Δ| 2.2 · 1 certs · `h408/elec+2mains | sandstone as | (another dwelling | sec:room heaters,whw903`
 - [ ] `80838` · L 41 / E 43.19 / Δ +2.19
 
-### C060 · Σ|Δ| 2.1 · 1 certs · `hpcdb18833/gas | solid brick | pitched insulated | RR,ext1,sec:room heaters`
+### C058 · Σ|Δ| 2.1 · 1 certs · `hpcdb18833/gas | solid brick | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `48056153` · L 65 / E 62.89 / Δ -2.11
 
-### C061 · Σ|Δ| 2.0 · 1 certs · `hpcdb19008/gas | solid brick | pitched insulated | sec:room heaters`
+### C059 · Σ|Δ| 2.0 · 1 certs · `hpcdb19008/gas | solid brick | pitched insulated | sec:room heaters`
 - [ ] `100021924710` · L 63 / E 65.00 / Δ +2.00
 
-### C062 · Σ|Δ| 1.9 · 1 certs · `hpcdb18774/gas | solid brick | pitched 100 | RR,ext1`
+### C060 · Σ|Δ| 1.9 · 1 certs · `hpcdb18774/gas | solid brick | pitched 100 | RR,ext1`
 - [ ] `100031270375` · L 69 / E 70.93 / Δ +1.93
 
-### C063 · Σ|Δ| 1.9 · 1 certs · `hpcdb106417/elec | cavity wall | pitched 250 | RR,ext2,sec:room heaters`
+### C061 · Σ|Δ| 1.9 · 1 certs · `hpcdb106417/elec | cavity wall | pitched 250 | RR,ext2,sec:room heaters`
 - [ ] `10001118522` · L 80 / E 78.07 / Δ -1.93
 
-### C064 · Σ|Δ| 1.9 · 1 certs · `h192/elec | cavity wall | (another dwelling`
+### C062 · Σ|Δ| 1.9 · 1 certs · `h192/elec | cavity wall | (another dwelling`
 - [ ] `10010234711` · L 81 / E 79.08 / Δ -1.92
 
-### C065 · Σ|Δ| 1.9 · 1 certs · `hpcdb18250/gas | solid brick | pitched 100 | consv2,sec:room heaters`
+### C063 · Σ|Δ| 1.9 · 1 certs · `hpcdb18250/gas | solid brick | pitched 100 | consv2,sec:room heaters`
 - [ ] `100031768368` · L 61 / E 59.12 / Δ -1.88
 
-### C066 · Σ|Δ| 1.8 · 1 certs · `h301/elec10hr | cavity wall | (another dwelling`
+### C064 · Σ|Δ| 1.8 · 1 certs · `h301/elec10hr | cavity wall | (another dwelling`
 - [ ] `4510729926` · L 73 / E 71.15 / Δ -1.85
 
-### C067 · Σ|Δ| 1.8 · 1 certs · `hpcdb17138/fuel28 | granite or | pitched 200 | ext1,sec:room heaters`
+### C065 · Σ|Δ| 1.8 · 1 certs · `hpcdb17138/fuel28 | granite or | pitched 200 | ext1,sec:room heaters`
 - [ ] `100091329112` · L 49 / E 50.82 / Δ +1.82
 
-### C068 · Σ|Δ| 1.8 · 2 certs · `hpcdb18908/gas | solid brick | pitched 300`
+### C066 · Σ|Δ| 1.8 · 2 certs · `hpcdb18908/gas | solid brick | pitched 300`
 - [ ] `100061275133` · L 76 / E 77.24 / Δ +1.24
 - [ ] `207032630` · L 74 / E 73.47 / Δ -0.53
 
-### C069 · Σ|Δ| 1.8 · 1 certs · `h691/elec | timber frame | pitched insulated | RR,ext1,sec:portable electric,whw908`
+### C067 · Σ|Δ| 1.8 · 1 certs · `h691/elec | timber frame | pitched insulated | RR,ext1,sec:portable electric,whw908`
 - [ ] `10011797347` · L 47 / E 48.77 / Δ +1.77
 
-### C070 · Σ|Δ| 1.8 · 1 certs · `hpcdb17570/gas+2mains | solid brick | (another dwelling | RR,ext3,sec:room heaters`
+### C068 · Σ|Δ| 1.8 · 1 certs · `hpcdb17570/gas+2mains | solid brick | (another dwelling | RR,ext3,sec:room heaters`
 - [ ] `100022668387` · L 68 / E 66.25 / Δ -1.75
 
-### C071 · Σ|Δ| 1.8 · 1 certs · `hpcdb17803/gas | timber frame | pitched 100`
+### C069 · Σ|Δ| 1.8 · 1 certs · `hpcdb17803/gas | timber frame | pitched 100`
 - [ ] `200004017091` · L 71 / E 72.75 / Δ +1.75
 
-### C072 · Σ|Δ| 1.7 · 1 certs · `hpcdb10354/gas+2mains | sandstone as | pitched 300 | ext1`
+### C070 · Σ|Δ| 1.7 · 1 certs · `hpcdb10354/gas+2mains | sandstone as | pitched 300 | ext1`
 - [ ] `100100892216` · L 69 / E 67.28 / Δ -1.72
 
-### C073 · Σ|Δ| 1.7 · 1 certs · `hpcdb8119/gas | cavity wall | pitched insulated | RR,ext1`
+### C071 · Σ|Δ| 1.7 · 1 certs · `hpcdb8119/gas | cavity wall | pitched insulated | RR,ext1`
 - [ ] `100060878876` · L 49 / E 50.71 / Δ +1.71
 
-### C074 · Σ|Δ| 1.7 · 1 certs · `h401/elec | solid brick | (another dwelling | sec:portable electric,whw950`
+### C072 · Σ|Δ| 1.7 · 1 certs · `h401/elec | solid brick | (another dwelling | sec:portable electric,whw950`
 - [ ] `22032926` · L 61 / E 62.71 / Δ +1.71
 
-### C075 · Σ|Δ| 1.7 · 1 certs · `hpcdb18560/gas | cavity wall | pitched insulated | RR,ext1`
+### C073 · Σ|Δ| 1.7 · 1 certs · `hpcdb18560/gas | cavity wall | pitched insulated | RR,ext1`
 - [ ] `100010942905` · L 72 / E 73.70 / Δ +1.70
 
-### C076 · Σ|Δ| 1.6 · 1 certs · `hpcdb18119/gas | solid brick | pitched 100 | ext1`
+### C074 · Σ|Δ| 1.6 · 1 certs · `hpcdb18119/gas | solid brick | pitched 100 | ext1`
 - [ ] `100030307976` · L 71 / E 69.37 / Δ -1.63
 
-### C077 · Σ|Δ| 1.6 · 1 certs · `hpcdb18909/gas | cavity wall | pitched 100 | whw903`
+### C075 · Σ|Δ| 1.6 · 1 certs · `hpcdb18909/gas | cavity wall | pitched 100 | whw903`
 - [ ] `100061404488` · L 70 / E 68.38 / Δ -1.62
 
-### C078 · Σ|Δ| 1.6 · 1 certs · `h402/elec | system built | (another dwelling | sec:room heaters,whw903`
+### C076 · Σ|Δ| 1.6 · 1 certs · `h402/elec | system built | (another dwelling | sec:room heaters,whw903`
 - [ ] `21067296` · L 67 / E 68.60 / Δ +1.60
 
-### C079 · Σ|Δ| 1.6 · 1 certs · `hpcdb10164/gas | solid brick | pitched insulated | sec:room heaters`
+### C077 · Σ|Δ| 1.6 · 1 certs · `hpcdb10164/gas | solid brick | pitched insulated | sec:room heaters`
 - [ ] `5870047440` · L 58 / E 59.58 / Δ +1.58
 
-### C080 · Σ|Δ| 1.6 · 1 certs · `hpcdb8051/gas | cavity wall | (same dwelling | ext2`
+### C078 · Σ|Δ| 1.6 · 1 certs · `hpcdb8051/gas | cavity wall | (same dwelling | ext2`
 - [ ] `100070450818` · L 65 / E 63.43 / Δ -1.57
 
-### C081 · Σ|Δ| 1.6 · 1 certs · `hpcdb17741/gas | cavity wall | pitched 225`
+### C079 · Σ|Δ| 1.6 · 1 certs · `hpcdb17741/gas | cavity wall | pitched 225`
 - [ ] `100050881708` · L 70 / E 71.55 / Δ +1.55
 
-### C082 · Σ|Δ| 1.5 · 1 certs · `h301/elec | system built | (another dwelling | whw950`
+### C080 · Σ|Δ| 1.5 · 1 certs · `h301/elec | system built | (another dwelling | whw950`
 - [ ] `10010254955` · L 79 / E 77.46 / Δ -1.54
 
-### C083 · Σ|Δ| 1.5 · 1 certs · `hpcdb16839/gas | cavity wall | pitched 400+ | ext1,mv2,sec:room heaters`
+### C081 · Σ|Δ| 1.5 · 1 certs · `hpcdb16839/gas | cavity wall | pitched 400+ | ext1,mv2,sec:room heaters`
 - [ ] `3455011834` · L 69 / E 67.48 / Δ -1.52
 
-### C084 · Σ|Δ| 1.5 · 1 certs · `hpcdb15502/gas | granite or | pitched 150 | RR,ext1,sec:room heaters`
+### C082 · Σ|Δ| 1.5 · 1 certs · `hpcdb15502/gas | granite or | pitched 150 | RR,ext1,sec:room heaters`
 - [ ] `100100274789` · L 60 / E 61.51 / Δ +1.51
 
-### C085 · Σ|Δ| 1.5 · 1 certs · `hpcdb16453/gas | cavity wall | pitched 300 | consv2,ext1`
+### C083 · Σ|Δ| 1.5 · 1 certs · `hpcdb16453/gas | cavity wall | pitched 300 | consv2,ext1`
 - [ ] `100050852755` · L 65 / E 66.49 / Δ +1.49
 
-### C086 · Σ|Δ| 1.5 · 1 certs · `hpcdb17679/gas | solid brick | pitched 125 | ext1`
+### C084 · Σ|Δ| 1.5 · 1 certs · `hpcdb17679/gas | solid brick | pitched 125 | ext1`
 - [ ] `100021326422` · L 70 / E 68.51 / Δ -1.49
 
-### C087 · Σ|Δ| 1.5 · 1 certs · `hpcdb15029/gas | solid brick | pitched insulated | RR,ext1`
+### C085 · Σ|Δ| 1.5 · 1 certs · `hpcdb15029/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `100050988345` · L 61 / E 59.51 / Δ -1.49
 
-### C088 · Σ|Δ| 1.5 · 1 certs · `hpcdb17998/gas | solid brick | pitched insulated | RR,consv2`
+### C086 · Σ|Δ| 1.5 · 1 certs · `hpcdb17998/gas | solid brick | pitched insulated | RR,consv2`
 - [ ] `100030285758` · L 54 / E 55.48 / Δ +1.48
 
-### C089 · Σ|Δ| 1.5 · 1 certs · `hpcdb17974/gas | cavity wall | pitched 175 | PV,ext1`
+### C087 · Σ|Δ| 1.5 · 1 certs · `hpcdb17974/gas | cavity wall | pitched 175 | PV,ext1`
 - [ ] `100090536443` · L 86 / E 84.52 / Δ -1.48
 
-### C090 · Σ|Δ| 1.4 · 1 certs · `hpcdb17978/gas | solid brick | flat no | RR,ext1`
+### C088 · Σ|Δ| 1.4 · 1 certs · `hpcdb17978/gas | solid brick | flat no | RR,ext1`
 - [ ] `line80` · L 72 / E 70.56 / Δ -1.44
 
-### C091 · Σ|Δ| 1.4 · 1 certs · `hpcdb10356/gas | solid brick | pitched 150 | RR,ext1,sec:room heaters`
+### C089 · Σ|Δ| 1.4 · 1 certs · `hpcdb10356/gas | solid brick | pitched 150 | RR,ext1,sec:room heaters`
 - [ ] `100080518673` · L 57 / E 58.42 / Δ +1.42
 
-### C092 · Σ|Δ| 1.4 · 1 certs · `hpcdb18561/gas | solid brick | pitched 250 | ext2`
+### C090 · Σ|Δ| 1.4 · 1 certs · `hpcdb18561/gas | solid brick | pitched 250 | ext2`
 - [ ] `235025284` · L 69 / E 67.59 / Δ -1.41
 
-### C093 · Σ|Δ| 1.4 · 1 certs · `hpcdb18767/gas | sandstone as | (another dwelling`
+### C091 · Σ|Δ| 1.4 · 1 certs · `hpcdb18767/gas | sandstone as | (another dwelling`
 - [ ] `250063088` · L 73 / E 71.60 / Δ -1.40
 
-### C094 · Σ|Δ| 1.4 · 1 certs · `hpcdb18991/fuel28 | solid brick | pitched 250 | sec:room heaters`
+### C092 · Σ|Δ| 1.4 · 1 certs · `hpcdb18991/fuel28 | solid brick | pitched 250 | sec:room heaters`
 - [ ] `100050048691` · L 58 / E 59.39 / Δ +1.39
 
-### C095 · Σ|Δ| 1.4 · 1 certs · `hpcdb16210/gas | cavity wall | pitched 300 | sec:room heaters`
+### C093 · Σ|Δ| 1.4 · 1 certs · `hpcdb16210/gas | cavity wall | pitched 300 | sec:room heaters`
 - [ ] `100110097281` · L 64 / E 65.37 / Δ +1.37
 
-### C096 · Σ|Δ| 1.4 · 1 certs · `h691/elec | solid brick | (another dwelling | whw903`
+### C094 · Σ|Δ| 1.4 · 1 certs · `h691/elec | solid brick | (another dwelling | whw903`
 - [ ] `10091630692` · L 58 / E 56.63 / Δ -1.37
 
-### C097 · Σ|Δ| 1.4 · 1 certs · `hpcdb19094/gas | cavity wall | (another dwelling | ext1,sec:room heaters`
+### C095 · Σ|Δ| 1.4 · 1 certs · `hpcdb19094/gas | cavity wall | (another dwelling | ext1,sec:room heaters`
 - [ ] `100031433810` · L 70 / E 68.63 / Δ -1.37
 
-### C098 · Σ|Δ| 1.3 · 1 certs · `hpcdb19227/fuel28 | solid brick | pitched 100 | RR,ext3,sec:room heaters`
+### C096 · Σ|Δ| 1.3 · 1 certs · `hpcdb19227/fuel28 | solid brick | pitched 100 | RR,ext3,sec:room heaters`
 - [ ] `100012368622` · L 39 / E 40.32 / Δ +1.32
 
-### C099 · Σ|Δ| 1.3 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,ext2,sec:room heaters`
+### C097 · Σ|Δ| 1.3 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,ext2,sec:room heaters`
 - [ ] `90077194` · L 65 / E 63.69 / Δ -1.31
 
-### C100 · Σ|Δ| 1.3 · 1 certs · `hpcdb19083/gas | cavity wall | pitched 75 | RR,consv2`
+### C098 · Σ|Δ| 1.3 · 1 certs · `hpcdb19083/gas | cavity wall | pitched 75 | RR,consv2`
 - [ ] `100031461986` · L 70 / E 71.29 / Δ +1.29
 
-### C101 · Σ|Δ| 1.3 · 1 certs · `h691/elec | granite or | pitched insulated | PV,ext3,whw903`
+### C099 · Σ|Δ| 1.3 · 1 certs · `h691/elec | granite or | pitched insulated | PV,ext3,whw903`
 - [ ] `30095054` · L 46 / E 44.74 / Δ -1.26
 
-### C102 · Σ|Δ| 1.3 · 1 certs · `hpcdb18335/gas | cavity wall | pitched 100 | RR,ext1,sec:room heaters`
+### C100 · Σ|Δ| 1.3 · 1 certs · `hpcdb18335/gas | cavity wall | pitched 100 | RR,ext1,sec:room heaters`
 - [ ] `100100055589` · L 58 / E 59.26 / Δ +1.26
 
-### C103 · Σ|Δ| 1.2 · 1 certs · `h409/elec | solid brick | (another dwelling | consv2,sec:portable electric,whw909`
+### C101 · Σ|Δ| 1.2 · 1 certs · `h409/elec | solid brick | (another dwelling | consv2,sec:portable electric,whw909`
 - [ ] `74061136` · L 73 / E 71.75 / Δ -1.25 <- electric storage cat7 E7: over-rate = off-peak rate/fraction too generous; needs Elmhurst tariff arbitration
 
-### C104 · Σ|Δ| 1.2 · 1 certs · `hpcdb15101/gas | cavity wall | pitched 270 | consv3,sec:room heaters`
+### C102 · Σ|Δ| 1.2 · 1 certs · `hpcdb15101/gas | cavity wall | pitched 270 | consv3,sec:room heaters`
 - [ ] `100091435353` · L 65 / E 66.23 / Δ +1.23
 
-### C105 · Σ|Δ| 1.2 · 2 certs · `h301/coal-anth | system built | (another dwelling`
+### C103 · Σ|Δ| 1.2 · 2 certs · `h301/coal-anth | system built | (another dwelling`
 - [ ] `10091070164` · L 69 / E 69.60 / Δ +0.60
 - [ ] `10090927185` · L 79 / E 79.60 / Δ +0.60
 
-### C106 · Σ|Δ| 1.2 · 1 certs · `hpcdb19110/gas | cavity wall | pitched no | ext3`
+### C104 · Σ|Δ| 1.2 · 1 certs · `hpcdb19110/gas | cavity wall | pitched no | ext3`
 - [ ] `100100614412` · L 53 / E 51.81 / Δ -1.19
 
-### C107 · Σ|Δ| 1.2 · 1 certs · `hpcdb18658/gas | solid brick | flat no`
+### C105 · Σ|Δ| 1.2 · 1 certs · `hpcdb18658/gas | solid brick | flat no`
 - [ ] `217091901` · L 62 / E 60.82 / Δ -1.18
 
-### C108 · Σ|Δ| 1.2 · 1 certs · `hpcdb17115/gas | sandstone as | (another dwelling | ext2,sec:room heaters`
+### C106 · Σ|Δ| 1.2 · 1 certs · `hpcdb17115/gas | sandstone as | (another dwelling | ext2,sec:room heaters`
 - [x] `line768` · L 57 / E 55.84 / Δ -1.16
 
-### C109 · Σ|Δ| 1.2 · 1 certs · `h102/gas | solid brick | (same dwelling | ext1,sec:portable electric`
+### C107 · Σ|Δ| 1.2 · 1 certs · `h102/gas | solid brick | (same dwelling | ext1,sec:portable electric`
 - [ ] `217061895` · L 61 / E 59.84 / Δ -1.16
 
-### C110 · Σ|Δ| 1.1 · 1 certs · `hpcdb15708/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C108 · Σ|Δ| 1.1 · 1 certs · `hpcdb15708/gas | cavity wall | pitched insulated | RR,sec:room heaters`
 - [ ] `10002349227` · L 76 / E 77.14 / Δ +1.14
 
-### C111 · Σ|Δ| 1.1 · 1 certs · `hpcdb15451/gas | timber frame | pitched insulated | RR,ext1,sec:room heaters`
+### C109 · Σ|Δ| 1.1 · 1 certs · `hpcdb15451/gas | timber frame | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `200001634005` · L 66 / E 67.11 / Δ +1.11
 
-### C112 · Σ|Δ| 1.1 · 1 certs · `hpcdb1770/fuel28 | solid brick | pitched no | ext3,sec:room heaters`
+### C110 · Σ|Δ| 1.1 · 1 certs · `hpcdb1770/fuel28 | solid brick | pitched no | ext3,sec:room heaters`
 - [ ] `200004522639` · L 37 / E 35.89 / Δ -1.11
 
-### C113 · Σ|Δ| 1.1 · 1 certs · `hpcdb16407/gas | cavity wall | pitched 250 | ext1,sec:room heaters`
+### C111 · Σ|Δ| 1.1 · 1 certs · `hpcdb16407/gas | cavity wall | pitched 250 | ext1,sec:room heaters`
 - [ ] `100071059081` · L 63 / E 64.09 / Δ +1.09
 
-### C114 · Σ|Δ| 1.1 · 1 certs · `hpcdb19007/gas+2mains | cavity wall | pitched 350 | ext2,mv5,sec:room heaters,whw914`
+### C112 · Σ|Δ| 1.1 · 1 certs · `hpcdb19007/gas+2mains | cavity wall | pitched 350 | ext2,mv5,sec:room heaters,whw914`
 - [ ] `100011820199` · L 55 / E 56.06 / Δ +1.06
 
-### C115 · Σ|Δ| 1.1 · 1 certs · `h691/elec | system built | (another dwelling | whw903`
+### C113 · Σ|Δ| 1.1 · 1 certs · `h691/elec | system built | (another dwelling | whw903`
 - [ ] `90214753` · L 83 / E 81.95 / Δ -1.05
 
-### C116 · Σ|Δ| 1.0 · 1 certs · `h102/gas | cavity wall | pitched insulated | consv2`
+### C114 · Σ|Δ| 1.0 · 1 certs · `h102/gas | cavity wall | pitched insulated | consv2`
 - [ ] `100051051866` · L 70 / E 71.04 / Δ +1.04
 
-### C117 · Σ|Δ| 1.0 · 1 certs · `hpcdb18737/gas | cavity wall | pitched insulated | PV,sec:room heaters`
+### C115 · Σ|Δ| 1.0 · 1 certs · `hpcdb18737/gas | cavity wall | pitched insulated | PV,sec:room heaters`
 - [ ] `10013836852` · L 100 / E 98.97 / Δ -1.03
 
-### C118 · Σ|Δ| 1.0 · 1 certs · `hpcdb17985/gas | solid brick | (another dwelling`
+### C116 · Σ|Δ| 1.0 · 1 certs · `hpcdb17985/gas | solid brick | (another dwelling`
 - [ ] `line899` · L 73 / E 71.97 / Δ -1.03
 
-### C119 · Σ|Δ| 1.0 · 1 certs · `hpcdb18524/gas+2mains | cavity wall | pitched 400+ | ext4`
+### C117 · Σ|Δ| 1.0 · 1 certs · `hpcdb18524/gas+2mains | cavity wall | pitched 400+ | ext4`
 - [ ] `40037847` · L 81 / E 79.98 / Δ -1.02
 
-### C120 · Σ|Δ| 1.0 · 1 certs · `hpcdb19012/gas | cavity wall | pitched insulated`
+### C118 · Σ|Δ| 1.0 · 1 certs · `hpcdb19012/gas | cavity wall | pitched insulated`
 - [ ] `10070056075` · L 80 / E 78.99 / Δ -1.01
 
-### C121 · Σ|Δ| 1.0 · 1 certs · `hpcdb16843/gas+2mains | cavity wall | pitched insulated | PV,RR,ext2`
+### C119 · Σ|Δ| 1.0 · 1 certs · `hpcdb16843/gas+2mains | cavity wall | pitched insulated | PV,RR,ext2`
 - [ ] `200131078` · L 86 / E 85.00 / Δ -1.00
 
-### C122 · Σ|Δ| 1.0 · 1 certs · `hpcdb17489/gas | cavity wall | pitched 270 | PV,consv2,ext1,sec:room heaters`
+### C120 · Σ|Δ| 1.0 · 1 certs · `hpcdb17489/gas | cavity wall | pitched 270 | PV,consv2,ext1,sec:room heaters`
 - [ ] `10000245212` · L 101 / E 100.00 / Δ -1.00
 
-### C123 · Σ|Δ| 1.0 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2,whw909`
+### C121 · Σ|Δ| 1.0 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2,whw909`
 - [ ] `15129162` · L 62 / E 61.00 / Δ -1.00
 
-### C124 · Σ|Δ| 1.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 270`
+### C122 · Σ|Δ| 1.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 270`
 - [ ] `23032873` · L 73 / E 72.00 / Δ -1.00
 
-### C125 · Σ|Δ| 1.0 · 1 certs · `hpcdb16930/gas | cavity wall | pitched unknown | RR,ext1,sec:room heaters`
+### C123 · Σ|Δ| 1.0 · 1 certs · `hpcdb16930/gas | cavity wall | pitched unknown | RR,ext1,sec:room heaters`
 - [ ] `45019020` · L 62 / E 61.01 / Δ -0.99
 
-### C126 · Σ|Δ| 1.0 · 1 certs · `hpcdb17939/gas | solid brick | (another dwelling`
+### C124 · Σ|Δ| 1.0 · 1 certs · `hpcdb17939/gas | solid brick | (another dwelling`
 - [ ] `42065028` · L 59 / E 58.02 / Δ -0.98
 
-### C127 · Σ|Δ| 1.0 · 1 certs · `hpcdb10071/gas | cavity wall | pitched 150 | RR`
+### C125 · Σ|Δ| 1.0 · 1 certs · `hpcdb10071/gas | cavity wall | pitched 150 | RR`
 - [ ] `10032928147` · L 77 / E 76.04 / Δ -0.96
 
-### C128 · Σ|Δ| 1.0 · 1 certs · `hpcdb17045/gas | cavity wall | pitched 300`
+### C126 · Σ|Δ| 1.0 · 1 certs · `hpcdb17045/gas | cavity wall | pitched 300`
 - [ ] `10010678937` · L 78 / E 77.04 / Δ -0.96
 
-### C129 · Σ|Δ| 1.0 · 1 certs · `hpcdb15247/gas | cavity wall | pitched insulated | RR`
+### C127 · Σ|Δ| 1.0 · 1 certs · `hpcdb15247/gas | cavity wall | pitched insulated | RR`
 - [ ] `100011010151` · L 62 / E 62.96 / Δ +0.96
 
-### C130 · Σ|Δ| 1.0 · 1 certs · `hpcdb16406/gas | solid brick | pitched insulated | RR,consv2,ext2,sec:room heaters`
+### C128 · Σ|Δ| 1.0 · 1 certs · `hpcdb16406/gas | solid brick | pitched insulated | RR,consv2,ext2,sec:room heaters`
 - [ ] `100050477371` · L 65 / E 64.04 / Δ -0.96
 
-### C131 · Σ|Δ| 0.9 · 1 certs · `hpcdb17529/fuel28 | cavity wall | pitched insulated | RR,ext2,sec:room heaters`
+### C129 · Σ|Δ| 0.9 · 1 certs · `hpcdb17529/fuel28 | cavity wall | pitched insulated | RR,ext2,sec:room heaters`
 - [ ] `10002945522` · L 61 / E 61.94 / Δ +0.94
 
-### C132 · Σ|Δ| 0.9 · 1 certs · `h691/elec+2mains | cob as | pitched 300 | whw903`
+### C130 · Σ|Δ| 0.9 · 1 certs · `h691/elec+2mains | cob as | pitched 300 | whw903`
 - [ ] `10032957680` · L 45 / E 45.94 / Δ +0.94
 
-### C133 · Σ|Δ| 0.9 · 1 certs · `hpcdb18204/gas | solid brick | pitched 400+ | PV,ext2`
+### C131 · Σ|Δ| 0.9 · 1 certs · `hpcdb18204/gas | solid brick | pitched 400+ | PV,ext2`
 - [ ] `2465057465` · L 81 / E 81.93 / Δ +0.93
 
-### C134 · Σ|Δ| 0.9 · 1 certs · `hpcdb19019/gas | solid brick | pitched 100 | ext3,sec:room heaters`
+### C132 · Σ|Δ| 0.9 · 1 certs · `hpcdb19019/gas | solid brick | pitched 100 | ext3,sec:room heaters`
 - [ ] `100090616327` · L 63 / E 63.93 / Δ +0.93
 
-### C135 · Σ|Δ| 0.9 · 1 certs · `hpcdb17612/gas | cavity wall | pitched 270 | ext1`
+### C133 · Σ|Δ| 0.9 · 1 certs · `hpcdb17612/gas | cavity wall | pitched 270 | ext1`
 - [ ] `100012753833` · L 74 / E 73.07 / Δ -0.93
 
-### C136 · Σ|Δ| 0.9 · 1 certs · `hpcdb19006/gas | solid brick | pitched 75 | ext1,sec:room heaters`
+### C134 · Σ|Δ| 0.9 · 1 certs · `hpcdb19006/gas | solid brick | pitched 75 | ext1,sec:room heaters`
 - [ ] `100031269525` · L 53 / E 53.91 / Δ +0.91
 
-### C137 · Σ|Δ| 0.9 · 1 certs · `hpcdb17964/gas | cavity wall | pitched insulated | consv3`
+### C135 · Σ|Δ| 0.9 · 1 certs · `hpcdb17964/gas | cavity wall | pitched insulated | consv3`
 - [ ] `200003725358` · L 75 / E 74.09 / Δ -0.91
 
-### C138 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | solid brick | pitched insulated | RR,ext3`
+### C136 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | solid brick | pitched insulated | RR,ext3`
 - [ ] `100050986162` · L 62 / E 61.10 / Δ -0.90
 
-### C139 · Σ|Δ| 0.9 · 1 certs · `hpcdb17985/gas | cavity wall | (another dwelling | mv2`
+### C137 · Σ|Δ| 0.9 · 1 certs · `hpcdb17985/gas | cavity wall | (another dwelling | mv2`
 - [ ] `5300000141` · L 78 / E 77.10 / Δ -0.90
 
-### C140 · Σ|Δ| 0.9 · 1 certs · `hpcdb18616/gas | cavity wall | pitched 250 | sec:room heaters`
+### C138 · Σ|Δ| 0.9 · 1 certs · `hpcdb18616/gas | cavity wall | pitched 250 | sec:room heaters`
 - [ ] `100050618404` · L 73 / E 73.89 / Δ +0.89
 
-### C141 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 250 | PV,ext1`
+### C139 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 250 | PV,ext1`
 - [ ] `100090476016` · L 81 / E 81.89 / Δ +0.89
 
-### C142 · Σ|Δ| 0.9 · 1 certs · `h691/elec | timber frame | pitched 200 | RR,ext3,whw903`
+### C140 · Σ|Δ| 0.9 · 1 certs · `h691/elec | timber frame | pitched 200 | RR,ext3,whw903`
 - [ ] `10012119141` · L 45 / E 45.89 / Δ +0.89
 
-### C143 · Σ|Δ| 0.9 · 1 certs · `h524/elec | cavity wall | pitched 300 | PV`
+### C141 · Σ|Δ| 0.9 · 1 certs · `h524/elec | cavity wall | pitched 300 | PV`
 - [ ] `100040938206` · L 75 / E 75.89 / Δ +0.89
 
-### C144 · Σ|Δ| 0.9 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | RR,consv2`
+### C142 · Σ|Δ| 0.9 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | RR,consv2`
 - [ ] `38188474` · L 76 / E 76.87 / Δ +0.87
 
-### C145 · Σ|Δ| 0.9 · 1 certs · `hpcdb16777/gas | cavity wall | pitched 100 | ext1,sec:room heaters`
+### C143 · Σ|Δ| 0.9 · 1 certs · `hpcdb16777/gas | cavity wall | pitched 100 | ext1,sec:room heaters`
 - [ ] `100061194957` · L 69 / E 69.87 / Δ +0.87
 
-### C146 · Σ|Δ| 0.9 · 1 certs · `hpcdb18559/gas+2mains | solid brick | pitched 200 | whw914`
+### C144 · Σ|Δ| 0.9 · 1 certs · `hpcdb18559/gas+2mains | solid brick | pitched 200 | whw914`
 - [ ] `100021236527` · L 72 / E 71.13 / Δ -0.87
 
-### C147 · Σ|Δ| 0.9 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 270 | consv2`
+### C145 · Σ|Δ| 0.9 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 270 | consv2`
 - [ ] `100040193752` · L 71 / E 71.86 / Δ +0.86
 
-### C148 · Σ|Δ| 0.9 · 1 certs · `hpcdb10327/gas | cavity wall | (another dwelling`
+### C146 · Σ|Δ| 0.9 · 1 certs · `hpcdb10327/gas | cavity wall | (another dwelling`
 - [ ] `100060701552` · L 74 / E 74.86 / Δ +0.86
 
-### C149 · Σ|Δ| 0.9 · 1 certs · `h691/elec | system built | flat insulated | whw903`
+### C147 · Σ|Δ| 0.9 · 1 certs · `h691/elec | system built | flat insulated | whw903`
 - [ ] `10070396146` · L 61 / E 60.14 / Δ -0.86
 
-### C150 · Σ|Δ| 0.8 · 1 certs · `hpcdb8587/gas | cavity wall | (another dwelling`
+### C148 · Σ|Δ| 0.8 · 1 certs · `hpcdb8587/gas | cavity wall | (another dwelling`
 - [ ] `100030528930` · L 74 / E 73.16 / Δ -0.84
 
-### C151 · Σ|Δ| 0.8 · 1 certs · `hpcdb18212/gas | solid brick | (another dwelling`
+### C149 · Σ|Δ| 0.8 · 1 certs · `hpcdb18212/gas | solid brick | (another dwelling`
 - [ ] `100020982570` · L 72 / E 71.17 / Δ -0.83
 
-### C152 · Σ|Δ| 0.8 · 1 certs · `hpcdb16888/gas | cavity wall | pitched 350 | consv2`
+### C150 · Σ|Δ| 0.8 · 1 certs · `hpcdb16888/gas | cavity wall | pitched 350 | consv2`
 - [ ] `394024487` · L 75 / E 74.17 / Δ -0.83
 
-### C153 · Σ|Δ| 0.8 · 1 certs · `hpcdb17503/gas | solid brick | pitched insulated | RR,ext1,mv4`
+### C151 · Σ|Δ| 0.8 · 1 certs · `hpcdb17503/gas | solid brick | pitched insulated | RR,ext1,mv4`
 - [ ] `217070698` · L 78 / E 78.83 / Δ +0.83
 
-### C154 · Σ|Δ| 0.8 · 1 certs · `hpcdb15709/gas | cavity wall | (another dwelling | ext1`
+### C152 · Σ|Δ| 0.8 · 1 certs · `hpcdb15709/gas | cavity wall | (another dwelling | ext1`
 - [ ] `77022508` · L 69 / E 68.18 / Δ -0.82
 
-### C155 · Σ|Δ| 0.8 · 1 certs · `hpcdb18496/gas | cavity wall | pitched 250 | RR,consv4`
+### C153 · Σ|Δ| 0.8 · 1 certs · `hpcdb18496/gas | cavity wall | pitched 250 | RR,consv4`
 - [ ] `100040259104` · L 68 / E 68.82 / Δ +0.82
 
-### C156 · Σ|Δ| 0.8 · 1 certs · `hpcdb18559/gas | solid brick | pitched 270 | ext1`
+### C154 · Σ|Δ| 0.8 · 1 certs · `hpcdb18559/gas | solid brick | pitched 270 | ext1`
 - [ ] `100031399026` · L 70 / E 70.81 / Δ +0.81
 
-### C157 · Σ|Δ| 0.8 · 1 certs · `hpcdb16374/gas | cavity wall | pitched unknown`
+### C155 · Σ|Δ| 0.8 · 1 certs · `hpcdb16374/gas | cavity wall | pitched unknown`
 - [ ] `10009645698` · L 67 / E 67.81 / Δ +0.81
 
-### C158 · Σ|Δ| 0.8 · 1 certs · `hpcdb16395/gas | timber frame | thatched with | ext1,sec:room heaters`
+### C156 · Σ|Δ| 0.8 · 1 certs · `hpcdb16395/gas | timber frame | thatched with | ext1,sec:room heaters`
 - [ ] `100080818887` · L 56 / E 55.19 / Δ -0.81
 
-### C159 · Σ|Δ| 0.8 · 1 certs · `hpcdb16835/gas | solid brick | pitched insulated | RR,ext1`
+### C157 · Σ|Δ| 0.8 · 1 certs · `hpcdb16835/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `100012374381` · L 69 / E 69.80 / Δ +0.80
 
-### C160 · Σ|Δ| 0.8 · 1 certs · `hpcdb17560/gas | cavity wall | pitched 250 | ext2`
+### C158 · Σ|Δ| 0.8 · 1 certs · `hpcdb17560/gas | cavity wall | pitched 250 | ext2`
 - [ ] `100012350270` · L 78 / E 77.20 / Δ -0.80
 
-### C161 · Σ|Δ| 0.8 · 1 certs · `hpcdb15166/gas+2mains | sandstone as | pitched no | PV,ext4,sec:room heaters,whw914`
+### C159 · Σ|Δ| 0.8 · 1 certs · `hpcdb15166/gas+2mains | sandstone as | pitched no | PV,ext4,sec:room heaters,whw914`
 - [ ] `100051109723` · L 60 / E 60.78 / Δ +0.78
 
-### C162 · Σ|Δ| 0.8 · 1 certs · `hpcdb18911/gas | cavity wall | pitched 50 | consv4`
+### C160 · Σ|Δ| 0.8 · 1 certs · `hpcdb18911/gas | cavity wall | pitched 50 | consv4`
 - [ ] `100061616915` · L 63 / E 62.22 / Δ -0.78
 
-### C163 · Σ|Δ| 0.8 · 1 certs · `h691/elec | cavity wall | pitched 200 | whw903`
+### C161 · Σ|Δ| 0.8 · 1 certs · `h691/elec | cavity wall | pitched 200 | whw903`
 - [ ] `line71` · L 74 / E 74.77 / Δ +0.77
 
-### C164 · Σ|Δ| 0.8 · 1 certs · `hpcdb17986/gas | cavity wall | (another dwelling`
+### C162 · Σ|Δ| 0.8 · 1 certs · `hpcdb17986/gas | cavity wall | (another dwelling`
 - [ ] `100011603934` · L 72 / E 71.23 / Δ -0.77
 
-### C165 · Σ|Δ| 0.8 · 1 certs · `hpcdb10244/gas | cavity wall | pitched 100`
+### C163 · Σ|Δ| 0.8 · 1 certs · `hpcdb10244/gas | cavity wall | pitched 100`
 - [ ] `24030987` · L 73 / E 73.76 / Δ +0.76
 
-### C166 · Σ|Δ| 0.8 · 1 certs · `h193/elec | solid brick | (another dwelling | whw909`
+### C164 · Σ|Δ| 0.8 · 1 certs · `h193/elec | solid brick | (another dwelling | whw909`
 - [ ] `100032043038` · L 74 / E 73.24 / Δ -0.76
 
-### C167 · Σ|Δ| 0.8 · 1 certs · `hpcdb17513/gas | cavity wall | pitched unknown`
+### C165 · Σ|Δ| 0.8 · 1 certs · `hpcdb17513/gas | cavity wall | pitched unknown`
 - [ ] `100010866608` · L 71 / E 70.24 / Δ -0.76
 
-### C168 · Σ|Δ| 0.7 · 1 certs · `hpcdb17965/gas | cavity wall | pitched insulated | RR,ext1,sec:room heaters`
+### C166 · Σ|Δ| 0.7 · 1 certs · `hpcdb17965/gas | cavity wall | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `100090399615` · L 67 / E 67.75 / Δ +0.75
 
-### C169 · Σ|Δ| 0.7 · 1 certs · `h691/elec | solid brick | roof room(s) | RR,ext2,sec:room heaters,whw903`
+### C167 · Σ|Δ| 0.7 · 1 certs · `h691/elec | solid brick | roof room(s) | RR,ext2,sec:room heaters,whw903`
 - [ ] `100062174575` · L 46 / E 46.75 / Δ +0.75
 
-### C170 · Σ|Δ| 0.7 · 1 certs · `hpcdb17576/gas | cavity wall | pitched insulated | RR,consv2`
+### C168 · Σ|Δ| 0.7 · 1 certs · `hpcdb16137/gas | solid brick | pitched 150`
+- [ ] `200004296092` · L 71 / E 71.74 / Δ +0.74
+
+### C169 · Σ|Δ| 0.7 · 1 certs · `hpcdb17576/gas | cavity wall | pitched insulated | RR,consv2`
 - [ ] `10012341135` · L 79 / E 79.73 / Δ +0.73
 
-### C171 · Σ|Δ| 0.7 · 1 certs · `h409/elec | cavity wall | (another dwelling | sec:portable electric,whw903`
+### C170 · Σ|Δ| 0.7 · 1 certs · `h409/elec | cavity wall | (another dwelling | sec:portable electric,whw903`
 - [ ] `100091005853` · L 70 / E 69.27 / Δ -0.73
 
-### C172 · Σ|Δ| 0.7 · 1 certs · `hpcdb18908/gas | cavity wall | pitched 175`
+### C171 · Σ|Δ| 0.7 · 1 certs · `hpcdb18908/gas | cavity wall | pitched 175`
 - [ ] `100021533514` · L 71 / E 71.73 / Δ +0.73
 
-### C173 · Σ|Δ| 0.7 · 1 certs · `h301/coal-anth | solid brick | (another dwelling`
+### C172 · Σ|Δ| 0.7 · 1 certs · `h301/coal-anth | solid brick | (another dwelling`
 - [ ] `5062075` · L 69 / E 69.72 / Δ +0.72
 
-### C174 · Σ|Δ| 0.7 · 1 certs · `hpcdb18112/gas | cavity wall | pitched 100 | RR,ext1`
+### C173 · Σ|Δ| 0.7 · 1 certs · `hpcdb18112/gas | cavity wall | pitched 100 | RR,ext1`
 - [ ] `100040813308` · L 62 / E 62.72 / Δ +0.72
 
-### C175 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched unknown | ext2`
+### C174 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched unknown | ext2`
 - [ ] `38105600` · L 68 / E 67.28 / Δ -0.72
 
-### C176 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched 200`
+### C175 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched 200`
 - [ ] `line255` · L 72 / E 71.29 / Δ -0.71
 
-### C177 · Σ|Δ| 0.7 · 1 certs · `h304/elec | cavity wall | (another dwelling | whw950`
+### C176 · Σ|Δ| 0.7 · 1 certs · `h304/elec | cavity wall | (another dwelling | whw950`
 - [ ] `5300047580` · L 69 / E 68.30 / Δ -0.70
 
-### C178 · Σ|Δ| 0.7 · 1 certs · `h104/gas | cavity wall | pitched 250 | ext1`
+### C177 · Σ|Δ| 0.7 · 1 certs · `h104/gas | cavity wall | pitched 250 | ext1`
 - [ ] `100110433403` · L 69 / E 68.32 / Δ -0.68
 
-### C179 · Σ|Δ| 0.7 · 1 certs · `hpcdb16835/gas | cavity wall | pitched insulated`
+### C178 · Σ|Δ| 0.7 · 1 certs · `hpcdb16835/gas | cavity wall | pitched insulated`
 - [ ] `10093416558` · L 79 / E 78.32 / Δ -0.68
 
-### C180 · Σ|Δ| 0.7 · 1 certs · `hpcdb18251/gas | solid brick | pitched 100`
+### C179 · Σ|Δ| 0.7 · 1 certs · `hpcdb18251/gas | solid brick | pitched 100`
 - [ ] `100050958217` · L 68 / E 68.68 / Δ +0.68
 
-### C181 · Σ|Δ| 0.7 · 1 certs · `hpcdb18224/gas | solid brick | pitched 225 | ext1`
+### C180 · Σ|Δ| 0.7 · 1 certs · `hpcdb18224/gas | solid brick | pitched 225 | ext1`
 - [ ] `100022667797` · L 68 / E 67.32 / Δ -0.68
 
-### C182 · Σ|Δ| 0.7 · 1 certs · `hpcdb10243/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C181 · Σ|Δ| 0.7 · 1 certs · `hpcdb10243/gas | cavity wall | pitched insulated | RR,sec:room heaters`
 - [ ] `100030528925` · L 78 / E 78.65 / Δ +0.65
 
-### C183 · Σ|Δ| 0.6 · 1 certs · `hpcdb17657/gas | cavity wall | (another dwelling`
+### C182 · Σ|Δ| 0.6 · 1 certs · `hpcdb17657/gas | cavity wall | (another dwelling`
 - [ ] `100110300037` · L 74 / E 73.35 / Δ -0.65
 
-### C184 · Σ|Δ| 0.6 · 1 certs · `hpcdb2044/gas | solid brick | (another dwelling | ext1`
+### C183 · Σ|Δ| 0.6 · 1 certs · `hpcdb2044/gas | solid brick | (another dwelling | ext1`
 - [ ] `217092450` · L 52 / E 52.64 / Δ +0.64
 
-### C185 · Σ|Δ| 0.6 · 1 certs · `hpcdb15101/gas | solid brick | pitched 300`
+### C184 · Σ|Δ| 0.6 · 1 certs · `hpcdb15101/gas | solid brick | pitched 300`
 - [ ] `100061164545` · L 72 / E 71.36 / Δ -0.64
 
-### C186 · Σ|Δ| 0.6 · 1 certs · `hpcdb10328/gas | cavity wall | pitched unknown`
+### C185 · Σ|Δ| 0.6 · 1 certs · `hpcdb10328/gas | cavity wall | pitched unknown`
 - [ ] `100051075936` · L 71 / E 70.36 / Δ -0.64
 
-### C187 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | cavity wall | roof room(s) | RR,sec:room heaters`
+### C186 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | cavity wall | roof room(s) | RR,sec:room heaters`
 - [ ] `100011565830` · L 72 / E 72.64 / Δ +0.64
 
-### C188 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | sandstone with | pitched 100 | RR,sec:room heaters`
+### C187 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | sandstone with | pitched 100 | RR,sec:room heaters`
 - [ ] `61010956` · L 75 / E 74.37 / Δ -0.63
 
-### C189 · Σ|Δ| 0.6 · 1 certs · `hpcdb17115/gas+2mains | cavity wall | pitched insulated | RR,ext4,sec:room heaters`
+### C188 · Σ|Δ| 0.6 · 1 certs · `hpcdb17115/gas+2mains | cavity wall | pitched insulated | RR,ext4,sec:room heaters`
 - [ ] `100110752514` · L 67 / E 67.62 / Δ +0.62
 
-### C190 · Σ|Δ| 0.6 · 1 certs · `h404/elec | cavity wall | pitched 175 | sec:room heaters,whw909`
+### C189 · Σ|Δ| 0.6 · 1 certs · `h404/elec | cavity wall | pitched 175 | sec:room heaters,whw909`
 - [ ] `100070295212` · L 75 / E 74.38 / Δ -0.62
 
-### C191 · Σ|Δ| 0.6 · 1 certs · `hpcdb18766/gas+2mains | sandstone as | pitched 100 | RR`
+### C190 · Σ|Δ| 0.6 · 1 certs · `hpcdb18766/gas+2mains | sandstone as | pitched 100 | RR`
 - [ ] `100012534027` · L 65 / E 64.38 / Δ -0.62
 
-### C192 · Σ|Δ| 0.6 · 1 certs · `hpcdb9058/fuel28 | solid brick | pitched 100 | RR,ext2,sec:room heaters`
+### C191 · Σ|Δ| 0.6 · 1 certs · `hpcdb9058/fuel28 | solid brick | pitched 100 | RR,ext2,sec:room heaters`
 - [x] `10009812472` · L 40 / E 39.40 / Δ -0.60
 
-### C193 · Σ|Δ| 0.6 · 1 certs · `hpcdb18218/gas | solid brick | (another dwelling`
+### C192 · Σ|Δ| 0.6 · 1 certs · `hpcdb18218/gas | solid brick | (another dwelling`
 - [ ] `34080035` · L 77 / E 76.41 / Δ -0.59
 
-### C194 · Σ|Δ| 0.6 · 1 certs · `hpcdb16137/gas | cavity wall | pitched 150 | RR,ext1`
+### C193 · Σ|Δ| 0.6 · 1 certs · `hpcdb16137/gas | cavity wall | pitched 150 | RR,ext1`
 - [ ] `21032732` · L 69 / E 69.59 / Δ +0.59
 
-### C195 · Σ|Δ| 0.6 · 1 certs · `h101/gas | cavity wall | pitched 100 | RR,ext1`
+### C194 · Σ|Δ| 0.6 · 1 certs · `h101/gas | cavity wall | pitched 100 | RR,ext1`
 - [ ] `100060562056` · L 66 / E 65.41 / Δ -0.59
 
-### C196 · Σ|Δ| 0.6 · 1 certs · `hpcdb17514/fuel27 | cavity wall | pitched 400+ | PV,ext2`
+### C195 · Σ|Δ| 0.6 · 1 certs · `hpcdb17514/fuel27 | cavity wall | pitched 400+ | PV,ext2`
 - [ ] `100091086558` · L 79 / E 79.58 / Δ +0.58
 
-### C197 · Σ|Δ| 0.6 · 1 certs · `hpcdb18908/gas | solid brick | (another dwelling`
+### C196 · Σ|Δ| 0.6 · 1 certs · `hpcdb18908/gas | solid brick | (another dwelling`
 - [ ] `line599` · L 74 / E 73.42 / Δ -0.58
 
-### C198 · Σ|Δ| 0.6 · 1 certs · `hpcdb17973/gas | cavity wall | pitched insulated`
+### C197 · Σ|Δ| 0.6 · 1 certs · `hpcdb17973/gas | cavity wall | pitched insulated`
 - [ ] `100020407741` · L 72 / E 71.42 / Δ -0.58
 
-### C199 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | cavity wall | pitched 200 | consv2,ext1,sec:room heaters`
+### C198 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | cavity wall | pitched 200 | consv2,ext1,sec:room heaters`
 - [ ] `100050839457` · L 70 / E 70.57 / Δ +0.57
 
-### C200 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,sec:room heaters`
+### C199 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,sec:room heaters`
 - [ ] `42105250` · L 59 / E 59.57 / Δ +0.57
 
-### C201 · Σ|Δ| 0.6 · 1 certs · `hpcdb1917/gas | timber frame | pitched insulated`
+### C200 · Σ|Δ| 0.6 · 1 certs · `hpcdb1917/gas | timber frame | pitched insulated`
 - [ ] `77200509` · L 69 / E 69.57 / Δ +0.57
 
-### C202 · Σ|Δ| 0.6 · 1 certs · `hpcdb10356/gas | cavity wall | pitched insulated | ext2`
+### C201 · Σ|Δ| 0.6 · 1 certs · `hpcdb10356/gas | cavity wall | pitched insulated | ext2`
 - [ ] `200040534` · L 65 / E 65.56 / Δ +0.56
 
+### C202 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | solid brick | pitched 150 | ext1,mv2`
+- [ ] `200049463` · L 69 / E 69.56 / Δ +0.56
+
 ### C203 · Σ|Δ| 0.6 · 1 certs · `h126/fuel28+2mains | cavity wall | pitched 300 | RR,consv2,ext3,sec:room heaters`
 - [ ] `100062527568` · L 61 / E 61.56 / Δ +0.56
 
@@ -839,6 +839,7 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [x] `100050553337` · L 70 / E 69.60 / Δ -0.40 · `hpcdb16839/gas | cavity wall | pitched 270 | sec:room heaters`
 - [x] `100071356612` · L 69 / E 68.61 / Δ -0.39 · `h301/coal-anth | solid brick | (another dwelling`
 - [x] `74041417` · L 79 / E 79.39 / Δ +0.39 · `hpcdb17507/gas | cavity wall | pitched 300 | PV`
+- [x] `100110452552` · L 67 / E 67.39 / Δ +0.39 · `hpcdb15068/gas | cavity wall | pitched 175 | mv2,sec:room heaters`
 - [x] `100022607800` · L 73 / E 72.61 / Δ -0.39 · `hpcdb18119/gas | solid brick | pitched 270`
 - [x] `100022277442` · L 58 / E 58.39 / Δ +0.39 · `h409/elec | cavity wall | pitched insulated | whw903`
 - [x] `250029611` · L 73 / E 72.61 / Δ -0.39 · `hpcdb17553/gas | cavity wall | pitched 250 | consv2,ext1`
@@ -885,7 +886,6 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [x] `1775087250` · L 75 / E 74.63 / Δ -0.37 · `hpcdb18861/gas | cavity wall | pitched 250 | ext1`
 - [x] `100061253556` · L 60 / E 59.63 / Δ -0.37 · `hpcdb18907/gas | cavity wall | pitched 100 | sec:room heaters`
 - [x] `6083595` · L 76 / E 76.37 / Δ +0.37 · `hpcdb17685/gas | cavity wall | pitched insulated`
-- [x] `100110452552` · L 67 / E 66.64 / Δ -0.36 · `hpcdb15068/gas | cavity wall | pitched 175 | mv2,sec:room heaters`
 - [x] `200033141` · L 76 / E 75.64 / Δ -0.36 · `hpcdb16738/gas | cavity wall | flat insulated`
 - [x] `100030357741` · L 72 / E 72.36 / Δ +0.36 · `hpcdb18560/gas | cavity wall | pitched 300 | consv2,ext1`
 - [x] `100080707176` · L 72 / E 71.64 / Δ -0.36 · `hpcdb10243/gas | cavity wall | pitched 100`
diff --git a/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py b/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
index cf5269895..d7e22cd64 100644
--- a/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
+++ b/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
@@ -774,6 +774,22 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
         cert_num="uprn-74061136",
         sap_score=72,
     ),
+    # UPRN 200004296092 (corpus; no cert number lodged). RdSAP-21.0.1 native —
+    # END-TERRACE HOUSE, TFA 62, age B, mains-gas COMBI (PCDB 16137), SOLID
+    # BRICK 360 mm "with external insulation" (wall_insulation_type 1) but
+    # thickness lodged "NI" (unknown). The wall added-insulation unknown-
+    # thickness cert: the §5.8 R-value gate needs thickness > 0, so the
+    # externally-insulated wall fell through to its UNINSULATED §5.6 U (1.40,
+    # walls 101.7 W/K, HLP 3.46) → PE +59.6, engine 64.35 (Δ −6.65 vs lodged
+    # 71). RdSAP 10 §5.4 (PDF p.32) "assume 100 mm if thickness is unknown"
+    # applies the 100 mm §5.8 default → U ~0.29, engine 71.74 = lodged. PINNED
+    # to the observed engine 72.
+    RealCertExpectation(
+        schema="RdSAP-Schema-21.0.1",
+        sample="uprn_200004296092",
+        cert_num="uprn-200004296092",
+        sap_score=72,
+    ),
 )
 
 
diff --git a/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py b/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
index 3841f0c41..36ea16c3a 100644
--- a/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
+++ b/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
@@ -295,7 +295,16 @@ _MIN_WITHIN_HALF_SAP = 0.770
 # and heats on demand -> 100% high rate. Cert 74061136 (HHR-storage flat,
 # WHC 909) +7.72 -> -1.25. Both the cost rate and the ADR-0014/CO2-PE fraction
 # fixed (fraction 0 -> 1.0). Unit-pinned in test_cert_to_inputs.
-_MAX_SAP_MAE = 0.659
+# 0.659 -> 0.648 via the wall added-insulation unknown-thickness fix: a
+# SOLID-BRICK/STONE wall lodging External/Internal insulation (type 1/3) with
+# thickness "NI" (unknown) was billed UNINSULATED (§5.8 R-value gate needs a
+# thickness > 0), over-counting wall heat loss. RdSAP 10 §5.4 (PDF p.32):
+# "assume 100 mm if thickness is unknown" -> apply the 100 mm §5.8 default.
+# Cert 200004296092 (age-B solid brick 360 mm + external, NI): walls 101.7 W/K
+# (U~1.4) -> ~0.29, PE +59.6 -> ~0, SAP 64.35 -> 71.74 (lodged 71). Scoped to
+# brick/stone (the only §5.8 R-value path); within-0.5 held at 77.0%, MAE
+# 0.658 -> 0.647, PE 3.2 -> 3.1. Unit-pinned in test_rdsap_uvalues.
+_MAX_SAP_MAE = 0.648
 _MAX_CO2_MAE_TONNES = 0.075     # t CO2 / yr vs co2_emissions_current
 _MAX_PE_PER_M2_MAE = 3.2        # kWh / m2 / yr vs energy_consumption_current