diff --git a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004017091/epc.json b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004017091/epc.json
new file mode 100644
index 000000000..80a987a43
--- /dev/null
+++ b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004017091/epc.json
@@ -0,0 +1,372 @@
+{
+  "uprn": 200004017091,
+  "roofs": [
+    {
+      "description": "Pitched, 100 mm loft insulation",
+      "energy_efficiency_rating": 3,
+      "environmental_efficiency_rating": 3
+    }
+  ],
+  "walls": [
+    {
+      "description": "Timber frame, as built, insulated (assumed)",
+      "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": 2,
+    "environmental_efficiency_rating": 2
+  },
+  "addendum": {
+    "addendum_numbers": [
+      15
+    ]
+  },
+  "lighting": {
+    "description": "Good lighting efficiency",
+    "energy_efficiency_rating": 4,
+    "environmental_efficiency_rating": 4
+  },
+  "postcode": "BN14 9EL",
+  "hot_water": {
+    "description": "From main system, no cylinder thermostat",
+    "energy_efficiency_rating": 3,
+    "environmental_efficiency_rating": 3
+  },
+  "post_town": "WORTHING",
+  "built_form": 3,
+  "created_at": "2026-04-21 13:18:06",
+  "door_count": 2,
+  "region_code": 14,
+  "report_type": 2,
+  "sap_heating": {
+    "number_baths": 1,
+    "cylinder_size": 0,
+    "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": 0,
+        "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": 17803
+      }
+    ],
+    "immersion_heating_type": "NA",
+    "has_fixed_air_conditioning": "false"
+  },
+  "sap_version": 10.2,
+  "sap_windows": [
+    {
+      "pvc_frame": "true",
+      "glazing_gap": "16+",
+      "orientation": 1,
+      "window_type": 1,
+      "glazing_type": 3,
+      "window_width": 1.1,
+      "window_height": 1.2,
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "glazing_gap": "16+",
+      "orientation": 1,
+      "window_type": 1,
+      "glazing_type": 3,
+      "window_width": 1.1,
+      "window_height": 1.2,
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "glazing_gap": "16+",
+      "orientation": 5,
+      "window_type": 1,
+      "glazing_type": 3,
+      "window_width": 1.1,
+      "window_height": 1.2,
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "glazing_gap": "16+",
+      "orientation": 5,
+      "window_type": 1,
+      "glazing_type": 3,
+      "window_width": 0.8,
+      "window_height": 0.8,
+      "draught_proofed": "true",
+      "window_location": 0,
+      "window_wall_type": 1,
+      "permanent_shutters_present": "N",
+      "permanent_shutters_insulated": "N"
+    },
+    {
+      "pvc_frame": "true",
+      "glazing_gap": "16+",
+      "orientation": 5,
+      "window_type": 1,
+      "glazing_type": 3,
+      "window_width": 1.5,
+      "window_height": 0.8,
+      "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": "ENG",
+  "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": "3 Radbone Close",
+  "assessment_type": "RdSAP",
+  "completion_date": "2026-04-21",
+  "inspection_date": "2026-04-20",
+  "extensions_count": 0,
+  "measurement_type": 1,
+  "total_floor_area": 65,
+  "transaction_type": 1,
+  "conservatory_type": 1,
+  "heated_room_count": 4,
+  "registration_date": "2026-04-21",
+  "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": "false",
+    "is_dwelling_export_capable": "false",
+    "wind_turbines_terrain_type": 2,
+    "electricity_smart_meter_present": "false"
+  },
+  "secondary_heating": {
+    "description": "None",
+    "energy_efficiency_rating": 0,
+    "environmental_efficiency_rating": 0
+  },
+  "extract_fans_count": 1,
+  "sap_building_parts": [
+    {
+      "identifier": "Main Dwelling",
+      "wall_dry_lined": "N",
+      "wall_thickness": 280,
+      "floor_heat_loss": 7,
+      "roof_construction": 4,
+      "wall_construction": 5,
+      "building_part_number": 1,
+      "sap_floor_dimensions": [
+        {
+          "floor": 0,
+          "room_height": {
+            "value": 2.37,
+            "quantity": "metres"
+          },
+          "floor_insulation": 1,
+          "total_floor_area": {
+            "value": 32.38,
+            "quantity": "square metres"
+          },
+          "party_wall_length": {
+            "value": 7.42,
+            "quantity": "metres"
+          },
+          "floor_construction": 1,
+          "heat_loss_perimeter": {
+            "value": 16.15,
+            "quantity": "metres"
+          }
+        },
+        {
+          "floor": 1,
+          "room_height": {
+            "value": 2.35,
+            "quantity": "metres"
+          },
+          "total_floor_area": {
+            "value": 32.37,
+            "quantity": "square metres"
+          },
+          "party_wall_length": {
+            "value": 7.42,
+            "quantity": "metres"
+          },
+          "heat_loss_perimeter": {
+            "value": 16.15,
+            "quantity": "metres"
+          }
+        }
+      ],
+      "wall_insulation_type": 4,
+      "construction_age_band": "G",
+      "party_wall_construction": 0,
+      "wall_thickness_measured": "Y",
+      "roof_insulation_location": 2,
+      "roof_insulation_thickness": "100mm",
+      "wall_insulation_thickness": "NI",
+      "floor_insulation_thickness": "NI"
+    }
+  ],
+  "solar_water_heating": "N",
+  "habitable_room_count": 4,
+  "heating_cost_current": {
+    "value": 556,
+    "currency": "GBP"
+  },
+  "insulated_door_count": 0,
+  "co2_emissions_current": 2.2,
+  "energy_rating_average": 60,
+  "energy_rating_current": 71,
+  "lighting_cost_current": {
+    "value": 51,
+    "currency": "GBP"
+  },
+  "main_heating_controls": [
+    {
+      "description": "Programmer, room thermostat and TRVs",
+      "energy_efficiency_rating": 4,
+      "environmental_efficiency_rating": 4
+    }
+  ],
+  "has_hot_water_cylinder": "true",
+  "heating_cost_potential": {
+    "value": 516,
+    "currency": "GBP"
+  },
+  "hot_water_cost_current": {
+    "value": 333,
+    "currency": "GBP"
+  },
+  "mechanical_ventilation": 0,
+  "percent_draughtproofed": 71,
+  "suggested_improvements": [
+    {
+      "sequence": 1,
+      "typical_saving": {
+        "value": 44,
+        "currency": "GBP"
+      },
+      "indicative_cost": "\u00a35,000 - \u00a310,000",
+      "improvement_type": "W2",
+      "improvement_details": {
+        "improvement_number": 58
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 73,
+      "environmental_impact_rating": 74
+    },
+    {
+      "sequence": 2,
+      "typical_saving": {
+        "value": 143,
+        "currency": "GBP"
+      },
+      "indicative_cost": "\u00a34,000 - \u00a37,000",
+      "improvement_type": "N",
+      "improvement_details": {
+        "improvement_number": 19
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 76,
+      "environmental_impact_rating": 79
+    },
+    {
+      "sequence": 3,
+      "typical_saving": {
+        "value": 212,
+        "currency": "GBP"
+      },
+      "indicative_cost": "\u00a38,000 - \u00a310,000",
+      "improvement_type": "U",
+      "improvement_details": {
+        "improvement_number": 34
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 81,
+      "environmental_impact_rating": 80
+    }
+  ],
+  "co2_emissions_potential": 1.5,
+  "energy_rating_potential": 81,
+  "lighting_cost_potential": {
+    "value": 51,
+    "currency": "GBP"
+  },
+  "schema_version_original": "21.0.1",
+  "hot_water_cost_potential": {
+    "value": 186,
+    "currency": "GBP"
+  },
+  "renewable_heat_incentive": {
+    "water_heating": 3562.39,
+    "space_heating_existing_dwelling": 4593.09
+  },
+  "draughtproofed_door_count": 0,
+  "energy_consumption_current": 184,
+  "has_fixed_air_conditioning": "false",
+  "multiple_glazed_proportion": 100,
+  "calculation_software_version": "5.02r0342",
+  "energy_consumption_potential": 118,
+  "environmental_impact_current": 72,
+  "current_energy_efficiency_band": "C",
+  "environmental_impact_potential": 80,
+  "has_heated_separate_conservatory": "false",
+  "potential_energy_efficiency_band": "B",
+  "co2_emissions_current_per_floor_area": 33,
+  "low_energy_fixed_lighting_bulbs_count": 12,
+  "incandescent_fixed_lighting_bulbs_count": 0
+}
\ No newline at end of file
diff --git a/domain/sap10_calculator/rdsap/cert_to_inputs.py b/domain/sap10_calculator/rdsap/cert_to_inputs.py
index 262c54f42..27451560e 100644
--- a/domain/sap10_calculator/rdsap/cert_to_inputs.py
+++ b/domain/sap10_calculator/rdsap/cert_to_inputs.py
@@ -7104,6 +7104,18 @@ def _cylinder_storage_loss_override(
     # 550 kWh/yr). The Table-2b temperature factor still applies (49)→(50).
     declared_loss = _float_or_none(getattr(sh, "cylinder_heat_loss", None))
     volume_l = _cylinder_volume_l_from_code(epc)
+    if volume_l is None and _int_or_none(sh.cylinder_size) == 0:
+        # gov-API cylinder_size=0 = "size not determined" for a present
+        # cylinder (has_hot_water_cylinder=true). RdSAP 10 §10.5 Table 28:
+        # "If the actual size is not determined, the size ... is taken as
+        # according to Table 28" → the "Normal" 110 L baseline, which STILL
+        # incurs a storage loss. Without this the code lookup returned None
+        # and the `if volume_l is None: return None` below dropped the loss,
+        # under-costing the DHW (7 corpus certs; e.g. 200004017091 +1.75 ->
+        # +0.39). Gated on the EXPLICIT 0 so a full-SAP cert whose RdSAP
+        # cylinder_size is simply unlodged (None, e.g. 10091568921) keeps its
+        # own cylinder handling rather than a forced 110 L RdSAP default.
+        volume_l = _CYLINDER_SIZE_NOT_DETERMINED_L
     if declared_loss is not None:
         storage_56m = cylinder_storage_loss_monthly_kwh(
             volume_l=volume_l or 0.0,
diff --git a/scripts/corpus_1000/worklist.md b/scripts/corpus_1000/worklist.md
index 07c3cccf3..7f57b370c 100644
--- a/scripts/corpus_1000/worklist.md
+++ b/scripts/corpus_1000/worklist.md
@@ -1,10 +1,10 @@
 # RdSAP-21.0.1 corpus campaign ledger
 
-**Gauge:** 1000 computed / 0 skipped · SAP within-0.5 = **77.0%** · MAE = **0.647** (floors in test_sap_accuracy_corpus.py)
+**Gauge:** 1000 computed / 0 skipped · SAP within-0.5 = **77.3%** · MAE = **0.648** (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).
 
-## Clusters (certs with |Δ| ≥ 0.5, ranked by summed |Δ|) — 230 certs in 222 clusters
+## Clusters (certs with |Δ| ≥ 0.5, ranked by summed |Δ|) — 227 certs in 220 clusters
 
 ### C001 · Σ|Δ| 23.9 · 1 certs · `hpcdb100053/elec | solid brick | (another dwelling | sec:room heaters`
 - ⚠ `4510053280` · L 51 / E 74.94 / Δ +23.94 <- lodged software billed out-of-range-PSR (2.031 > 2.0) PCDB 100053 as 100% direct electric; engine follows SAP10.2 N2 extension (305%), Elmhurst-validated on case 56. Pinned engine 75 in test_real_cert_sap_accuracy.
@@ -12,8 +12,8 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 ### C002 · Σ|Δ| 19.7 · 1 certs · `h301/coal-anth | cavity wall | pitched unknown | whw903`
 - [ ] `103001004` · L 50 / E 69.69 / Δ +19.69 <- needs Elmhurst arbitration: lodged hw £1054 vs ours £113 (single-immersion on-peak fraction + cylinder declared-loss 1.8 kWh/day vs Table-2-sized loss); register data can't decompose. Other 14 declared-loss certs match lodged; only sibling outlier is 100121325434 (C008).
 
-### C003 · Σ|Δ| 14.5 · 1 certs · `h195/elec | system built | (another dwelling`
-- [ ] `10012334488` · L 72 / E 86.47 / Δ +14.47
+### C003 · Σ|Δ| 13.2 · 1 certs · `h195/elec | system built | (another dwelling`
+- [ ] `10012334488` · L 72 / E 85.20 / Δ +13.20
 
 ### C004 · Σ|Δ| 13.1 · 1 certs · `hpcdb10326/gas | solid brick | pitched 75 | ext1,sec:room heaters`
 - [ ] `12109191` · L 58 / E 71.10 / Δ +13.10
@@ -42,55 +42,54 @@ 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| 6.5 · 1 certs · `h408/elec | granite or | (another dwelling | sec:portable electric,whw903`
+### C012 · Σ|Δ| 6.5 · 1 certs · `h191/elec | cavity wall | (another dwelling`
+- [ ] `10002272664` · L 79 / E 72.47 / Δ -6.53
+
+### C013 · 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
 
-### C013 · Σ|Δ| 6.5 · 1 certs · `h691/elec | solid brick | (another dwelling | ext1,sec:room heaters,whw903`
+### C014 · 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
 
-### C014 · Σ|Δ| 6.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 225`
+### C015 · Σ|Δ| 6.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 225`
 - [ ] `100050844968` · L 71 / E 65.02 / Δ -5.98
 
-### C015 · Σ|Δ| 5.8 · 1 certs · `hpcdb17777/gas+2mains | cavity wall | pitched insulated | ext1,sec:room heaters,whw914`
+### C016 · 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
 
-### 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
+### C017 · Σ|Δ| 5.8 · 1 certs · `h408/elec+2mains | sandstone as | (another dwelling | sec:room heaters,whw903`
+- [ ] `80838` · L 41 / E 35.25 / Δ -5.75
 
-### C017 · Σ|Δ| 4.6 · 1 certs · `hpcdb18560/gas | solid brick | pitched no | RR`
+### C018 · Σ|Δ| 4.6 · 1 certs · `hpcdb18560/gas | solid brick | pitched no | RR`
 - [ ] `100051233481` · L 65 / E 69.64 / Δ +4.64
 
-### C018 · Σ|Δ| 4.5 · 1 certs · `h691/elec | timber frame | pitched limited | RR,ext2,whw903`
+### C019 · Σ|Δ| 4.5 · 1 certs · `h691/elec | timber frame | pitched limited | RR,ext2,whw903`
 - [ ] `100061646773` · L 68 / E 63.46 / Δ -4.54
 
-### C019 · Σ|Δ| 4.5 · 1 certs · `hpcdb18786/fuel27 | solid brick | pitched 100 | RR,consv3`
+### C020 · Σ|Δ| 4.5 · 1 certs · `hpcdb18786/fuel27 | solid brick | pitched 100 | RR,consv3`
 - [ ] `100071010014` · L 55 / E 50.47 / Δ -4.53
 
-### C020 · Σ|Δ| 4.5 · 1 certs · `hpcdb17815/gas | cavity wall | flat insulated`
+### C021 · Σ|Δ| 4.5 · 1 certs · `hpcdb17815/gas | cavity wall | flat insulated`
 - [ ] `47084930` · L 74 / E 69.51 / Δ -4.49
 
-### C021 · Σ|Δ| 4.5 · 1 certs · `h301/coal-anth | system built | (another dwelling | mv4`
+### C022 · Σ|Δ| 4.5 · 1 certs · `h301/coal-anth | system built | (another dwelling | mv4`
 - [ ] `10093342182` · L 82 / E 77.51 / Δ -4.49
 
-### C022 · Σ|Δ| 4.4 · 1 certs · `hpcdb17973/gas | solid brick | (another dwelling`
+### C023 · Σ|Δ| 4.4 · 1 certs · `hpcdb17973/gas | solid brick | (another dwelling`
 - [ ] `5117280` · L 76 / E 71.56 / Δ -4.44
 
-### C023 · Σ|Δ| 4.4 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2`
+### C024 · Σ|Δ| 4.4 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2`
 - [ ] `217060420` · L 42 / E 37.58 / Δ -4.42
 
-### C024 · Σ|Δ| 4.4 · 1 certs · `h402/elec | cavity wall | (another dwelling | sec:room heaters,whw903`
+### C025 · 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
 
-### C025 · Σ|Δ| 4.4 · 1 certs · `hpcdb19258/fuel28 | granite or | pitched no | ext2,sec:room heaters`
+### C026 · 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
 
-### C026 · Σ|Δ| 4.1 · 1 certs · `h633/heatnet | sandstone with | pitched insulated | sec:room heaters,whw903`
+### C027 · 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
 
-### C027 · Σ|Δ| 4.0 · 1 certs · `h191/elec | cavity wall | (another dwelling`
-- [ ] `10002272664` · L 79 / E 74.96 / Δ -4.04
-
 ### 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
 
@@ -112,77 +111,77 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 ### 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
 
-### C035 · Σ|Δ| 3.2 · 1 certs · `hpcdb18759/gas | sandstone as | pitched insulated | RR,ext1,sec:room heaters`
+### C035 · Σ|Δ| 3.2 · 1 certs · `hpcdb1770/fuel28 | solid brick | pitched no | ext3,sec:room heaters`
+- [ ] `200004522639` · L 37 / E 33.77 / Δ -3.23
+
+### C036 · 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
 
-### C036 · Σ|Δ| 3.1 · 1 certs · `h633/heatnet | timber frame | roof room(s) | RR,ext1,sec:room heaters,whw909`
+### C037 · 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
 
-### C037 · Σ|Δ| 3.0 · 1 certs · `hpcdb18498/gas | solid brick | pitched 250 | RR,ext2`
+### C038 · Σ|Δ| 3.0 · 1 certs · `hpcdb18498/gas | solid brick | pitched 250 | RR,ext2`
 - [ ] `10011740578` · L 70 / E 67.00 / Δ -3.00
 
-### C038 · Σ|Δ| 2.9 · 1 certs · `h402/elec | cavity wall | pitched 250 | sec:portable electric,whw903`
+### C039 · 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
 
-### C039 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | solid brick | pitched 250`
+### C040 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | solid brick | pitched 250`
 - [ ] `452032915` · L 75 / E 72.09 / Δ -2.91
 
-### C040 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | cavity wall | (another dwelling | whw909`
+### C041 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | cavity wall | (another dwelling | whw909`
 - [ ] `100071306639` · L 73 / E 70.14 / Δ -2.86
 
-### C041 · Σ|Δ| 2.9 · 1 certs · `hpcdb18435/gas+2mains | cavity wall | pitched 100 | ext3,sec:room heaters,whw903`
+### C042 · 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
 
-### C042 · Σ|Δ| 2.7 · 1 certs · `hpcdb8443/fuel28 | cavity wall | pitched 100 | RR,ext2,sec:room heaters`
+### C043 · 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
 
-### C043 · Σ|Δ| 2.7 · 3 certs · `h691/elec | cavity wall | (another dwelling | whw903`
+### C044 · 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
 
-### C044 · Σ|Δ| 2.7 · 1 certs · `h633/heatnet | cavity wall | pitched 200 | RR,sec:room heaters,whw903`
+### C045 · 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
 
-### C045 · Σ|Δ| 2.7 · 1 certs · `h691/elec | cavity wall | (another dwelling | mv1,whw903`
+### C046 · Σ|Δ| 2.7 · 1 certs · `h691/elec | cavity wall | (another dwelling | mv1,whw903`
 - [ ] `10090793715` · L 73 / E 75.71 / Δ +2.71
 
-### C046 · Σ|Δ| 2.7 · 1 certs · `hpcdb17964/gas+2mains | cavity wall | pitched 100 | ext1,sec:room heaters`
+### C047 · 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
 
-### C047 · Σ|Δ| 2.7 · 1 certs · `hpcdb17757/gas | granite or | pitched no | RR,ext1`
+### C048 · Σ|Δ| 2.7 · 1 certs · `hpcdb17757/gas | granite or | pitched no | RR,ext1`
 - [ ] `100051178830` · L 63 / E 65.66 / Δ +2.66
 
-### C048 · Σ|Δ| 2.6 · 1 certs · `hpcdb10321/gas | sandstone as | pitched 100 | ext2`
+### C049 · Σ|Δ| 2.6 · 1 certs · `hpcdb10321/gas | sandstone as | pitched 100 | ext2`
 - [ ] `100120018282` · L 64 / E 61.36 / Δ -2.64
 
-### C049 · Σ|Δ| 2.6 · 1 certs · `hpcdb17968/gas | cavity wall | pitched 300 | ext2,sec:room heaters`
+### C050 · 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
 
-### C050 · Σ|Δ| 2.5 · 1 certs · `h524/elec | solid brick | (another dwelling | consv2,sec:room heaters,whw909`
+### C051 · 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
 
-### C051 · Σ|Δ| 2.5 · 1 certs · `hpcdb10328/gas | solid brick | pitched insulated | RR`
+### C052 · Σ|Δ| 2.5 · 1 certs · `hpcdb10328/gas | solid brick | pitched insulated | RR`
 - [ ] `100050964834` · L 60 / E 62.47 / Δ +2.47
 
-### C052 · Σ|Δ| 2.4 · 1 certs · `h694/elec | cavity wall | (another dwelling | whw941`
+### C053 · Σ|Δ| 2.4 · 1 certs · `h694/elec | cavity wall | (another dwelling | whw941`
 - [ ] `100120752995` · L 71 / E 73.42 / Δ +2.42
 
-### C053 · Σ|Δ| 2.4 · 1 certs · `hpcdb1245/gas | solid brick | pitched insulated | ext1`
+### C054 · Σ|Δ| 2.4 · 1 certs · `hpcdb1245/gas | solid brick | pitched insulated | ext1`
 - [ ] `100032230128` · L 55 / E 52.60 / Δ -2.40
 
-### C054 · Σ|Δ| 2.3 · 1 certs · `hpcdb15753/gas | solid brick | pitched 150 | RR`
+### C055 · Σ|Δ| 2.3 · 1 certs · `hpcdb15753/gas | solid brick | pitched 150 | RR`
 - [ ] `100000034023` · L 73 / E 70.71 / Δ -2.29
 
-### C055 · Σ|Δ| 2.2 · 1 certs · `h506/gas | cavity wall | flat limited | sec:room heaters`
+### C056 · Σ|Δ| 2.2 · 1 certs · `h506/gas | cavity wall | flat limited | sec:room heaters`
 - [ ] `100020377671` · L 62 / E 64.23 / Δ +2.23
 
-### C056 · Σ|Δ| 2.2 · 1 certs · `h104/gas | solid brick | pitched insulated | RR,ext1`
+### C057 · Σ|Δ| 2.2 · 1 certs · `h104/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `22027335` · L 76 / E 73.77 / Δ -2.23
 
-### 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
-
 ### 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
 
@@ -217,15 +216,15 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 ### 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
 
-### C069 · Σ|Δ| 1.8 · 1 certs · `hpcdb17803/gas | timber frame | pitched 100`
-- [ ] `200004017091` · L 71 / E 72.75 / Δ +1.75
-
-### C070 · Σ|Δ| 1.7 · 1 certs · `hpcdb10354/gas+2mains | sandstone as | pitched 300 | ext1`
+### C069 · Σ|Δ| 1.7 · 1 certs · `hpcdb10354/gas+2mains | sandstone as | pitched 300 | ext1`
 - [ ] `100100892216` · L 69 / E 67.28 / Δ -1.72
 
-### C071 · Σ|Δ| 1.7 · 1 certs · `hpcdb8119/gas | cavity wall | pitched insulated | RR,ext1`
+### C070 · Σ|Δ| 1.7 · 1 certs · `hpcdb8119/gas | cavity wall | pitched insulated | RR,ext1`
 - [ ] `100060878876` · L 49 / E 50.71 / Δ +1.71
 
+### C071 · Σ|Δ| 1.7 · 1 certs · `h402/elec | solid brick | (another dwelling | sec:portable electric,whw903`
+- [ ] `12126160` · L 69 / E 70.71 / Δ +1.71
+
 ### 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
 
@@ -286,401 +285,395 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 ### C091 · Σ|Δ| 1.4 · 1 certs · `hpcdb18767/gas | sandstone as | (another dwelling`
 - [ ] `250063088` · L 73 / E 71.60 / Δ -1.40
 
-### 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
-
-### C093 · Σ|Δ| 1.4 · 1 certs · `hpcdb16210/gas | cavity wall | pitched 300 | sec:room heaters`
+### C092 · Σ|Δ| 1.4 · 1 certs · `hpcdb16210/gas | cavity wall | pitched 300 | sec:room heaters`
 - [ ] `100110097281` · L 64 / E 65.37 / Δ +1.37
 
-### C094 · Σ|Δ| 1.4 · 1 certs · `h691/elec | solid brick | (another dwelling | whw903`
+### C093 · Σ|Δ| 1.4 · 1 certs · `h691/elec | solid brick | (another dwelling | whw903`
 - [ ] `10091630692` · L 58 / E 56.63 / Δ -1.37
 
-### C095 · Σ|Δ| 1.4 · 1 certs · `hpcdb19094/gas | cavity wall | (another dwelling | ext1,sec:room heaters`
+### C094 · 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
 
-### C096 · Σ|Δ| 1.3 · 1 certs · `hpcdb19227/fuel28 | solid brick | pitched 100 | RR,ext3,sec:room heaters`
+### C095 · 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
 
-### C097 · Σ|Δ| 1.3 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,ext2,sec:room heaters`
+### C096 · 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
 
-### C098 · Σ|Δ| 1.3 · 1 certs · `hpcdb19083/gas | cavity wall | pitched 75 | RR,consv2`
+### C097 · Σ|Δ| 1.3 · 1 certs · `hpcdb19083/gas | cavity wall | pitched 75 | RR,consv2`
 - [ ] `100031461986` · L 70 / E 71.29 / Δ +1.29
 
-### C099 · Σ|Δ| 1.3 · 1 certs · `h691/elec | granite or | pitched insulated | PV,ext3,whw903`
+### C098 · Σ|Δ| 1.3 · 1 certs · `h691/elec | granite or | pitched insulated | PV,ext3,whw903`
 - [ ] `30095054` · L 46 / E 44.74 / Δ -1.26
 
-### C100 · Σ|Δ| 1.3 · 1 certs · `hpcdb18335/gas | cavity wall | pitched 100 | RR,ext1,sec:room heaters`
+### C099 · 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
 
-### C101 · Σ|Δ| 1.2 · 1 certs · `h409/elec | solid brick | (another dwelling | consv2,sec:portable electric,whw909`
+### C100 · 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
 
-### C102 · Σ|Δ| 1.2 · 1 certs · `hpcdb15101/gas | cavity wall | pitched 270 | consv3,sec:room heaters`
+### C101 · 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
 
-### C103 · Σ|Δ| 1.2 · 2 certs · `h301/coal-anth | system built | (another dwelling`
+### C102 · 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
 
-### C104 · Σ|Δ| 1.2 · 1 certs · `hpcdb19110/gas | cavity wall | pitched no | ext3`
+### C103 · Σ|Δ| 1.2 · 1 certs · `hpcdb19110/gas | cavity wall | pitched no | ext3`
 - [ ] `100100614412` · L 53 / E 51.81 / Δ -1.19
 
-### C105 · Σ|Δ| 1.2 · 1 certs · `hpcdb18658/gas | solid brick | flat no`
+### C104 · Σ|Δ| 1.2 · 1 certs · `hpcdb18658/gas | solid brick | flat no`
 - [ ] `217091901` · L 62 / E 60.82 / Δ -1.18
 
-### C106 · Σ|Δ| 1.2 · 1 certs · `hpcdb17115/gas | sandstone as | (another dwelling | ext2,sec:room heaters`
+### C105 · 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
 
-### C107 · Σ|Δ| 1.2 · 1 certs · `h102/gas | solid brick | (same dwelling | ext1,sec:portable electric`
+### C106 · 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
 
-### C108 · Σ|Δ| 1.1 · 1 certs · `hpcdb15708/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C107 · 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
 
-### C109 · Σ|Δ| 1.1 · 1 certs · `hpcdb15451/gas | timber frame | pitched insulated | RR,ext1,sec:room heaters`
+### C108 · 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
 
-### 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
-
-### C111 · Σ|Δ| 1.1 · 1 certs · `hpcdb16407/gas | cavity wall | pitched 250 | ext1,sec:room heaters`
+### C109 · 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
 
-### C112 · Σ|Δ| 1.1 · 1 certs · `hpcdb19007/gas+2mains | cavity wall | pitched 350 | ext2,mv5,sec:room heaters,whw914`
+### C110 · 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
 
-### C113 · Σ|Δ| 1.1 · 1 certs · `h691/elec | system built | (another dwelling | whw903`
+### C111 · Σ|Δ| 1.1 · 1 certs · `h691/elec | system built | (another dwelling | whw903`
 - [ ] `90214753` · L 83 / E 81.95 / Δ -1.05
 
-### C114 · Σ|Δ| 1.0 · 1 certs · `h102/gas | cavity wall | pitched insulated | consv2`
+### C112 · Σ|Δ| 1.0 · 1 certs · `h102/gas | cavity wall | pitched insulated | consv2`
 - [ ] `100051051866` · L 70 / E 71.04 / Δ +1.04
 
-### C115 · Σ|Δ| 1.0 · 1 certs · `hpcdb18737/gas | cavity wall | pitched insulated | PV,sec:room heaters`
+### C113 · 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
 
-### C116 · Σ|Δ| 1.0 · 1 certs · `hpcdb17985/gas | solid brick | (another dwelling`
+### C114 · Σ|Δ| 1.0 · 1 certs · `hpcdb17985/gas | solid brick | (another dwelling`
 - [ ] `line899` · L 73 / E 71.97 / Δ -1.03
 
-### C117 · Σ|Δ| 1.0 · 1 certs · `hpcdb18524/gas+2mains | cavity wall | pitched 400+ | ext4`
+### C115 · Σ|Δ| 1.0 · 1 certs · `hpcdb18524/gas+2mains | cavity wall | pitched 400+ | ext4`
 - [ ] `40037847` · L 81 / E 79.98 / Δ -1.02
 
-### C118 · Σ|Δ| 1.0 · 1 certs · `hpcdb19012/gas | cavity wall | pitched insulated`
+### C116 · Σ|Δ| 1.0 · 1 certs · `hpcdb19012/gas | cavity wall | pitched insulated`
 - [ ] `10070056075` · L 80 / E 78.99 / Δ -1.01
 
-### C119 · Σ|Δ| 1.0 · 1 certs · `hpcdb16843/gas+2mains | cavity wall | pitched insulated | PV,RR,ext2`
+### C117 · 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
 
-### C120 · Σ|Δ| 1.0 · 1 certs · `hpcdb17489/gas | cavity wall | pitched 270 | PV,consv2,ext1,sec:room heaters`
+### C118 · 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
 
-### C121 · Σ|Δ| 1.0 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2,whw909`
+### C119 · Σ|Δ| 1.0 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2,whw909`
 - [ ] `15129162` · L 62 / E 61.00 / Δ -1.00
 
-### C122 · Σ|Δ| 1.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 270`
+### C120 · Σ|Δ| 1.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 270`
 - [ ] `23032873` · L 73 / E 72.00 / Δ -1.00
 
-### C123 · Σ|Δ| 1.0 · 1 certs · `hpcdb16930/gas | cavity wall | pitched unknown | RR,ext1,sec:room heaters`
+### C121 · 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
 
-### C124 · Σ|Δ| 1.0 · 1 certs · `hpcdb17939/gas | solid brick | (another dwelling`
+### C122 · Σ|Δ| 1.0 · 1 certs · `hpcdb17939/gas | solid brick | (another dwelling`
 - [ ] `42065028` · L 59 / E 58.02 / Δ -0.98
 
-### C125 · Σ|Δ| 1.0 · 1 certs · `hpcdb10071/gas | cavity wall | pitched 150 | RR`
+### C123 · Σ|Δ| 1.0 · 1 certs · `hpcdb10071/gas | cavity wall | pitched 150 | RR`
 - [ ] `10032928147` · L 77 / E 76.04 / Δ -0.96
 
-### C126 · Σ|Δ| 1.0 · 1 certs · `hpcdb17045/gas | cavity wall | pitched 300`
+### C124 · Σ|Δ| 1.0 · 1 certs · `hpcdb17045/gas | cavity wall | pitched 300`
 - [ ] `10010678937` · L 78 / E 77.04 / Δ -0.96
 
-### C127 · Σ|Δ| 1.0 · 1 certs · `hpcdb15247/gas | cavity wall | pitched insulated | RR`
+### C125 · Σ|Δ| 1.0 · 1 certs · `hpcdb15247/gas | cavity wall | pitched insulated | RR`
 - [ ] `100011010151` · L 62 / E 62.96 / Δ +0.96
 
-### C128 · Σ|Δ| 1.0 · 1 certs · `hpcdb16406/gas | solid brick | pitched insulated | RR,consv2,ext2,sec:room heaters`
+### C126 · 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
 
-### C129 · Σ|Δ| 0.9 · 1 certs · `hpcdb17529/fuel28 | cavity wall | pitched insulated | RR,ext2,sec:room heaters`
+### C127 · 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
 
-### C130 · Σ|Δ| 0.9 · 1 certs · `h691/elec+2mains | cob as | pitched 300 | whw903`
+### C128 · Σ|Δ| 0.9 · 1 certs · `h691/elec+2mains | cob as | pitched 300 | whw903`
 - [ ] `10032957680` · L 45 / E 45.94 / Δ +0.94
 
-### C131 · Σ|Δ| 0.9 · 1 certs · `hpcdb18204/gas | solid brick | pitched 400+ | PV,ext2`
+### C129 · Σ|Δ| 0.9 · 1 certs · `hpcdb18204/gas | solid brick | pitched 400+ | PV,ext2`
 - [ ] `2465057465` · L 81 / E 81.93 / Δ +0.93
 
-### C132 · Σ|Δ| 0.9 · 1 certs · `hpcdb19019/gas | solid brick | pitched 100 | ext3,sec:room heaters`
+### C130 · 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
 
-### C133 · Σ|Δ| 0.9 · 1 certs · `hpcdb17612/gas | cavity wall | pitched 270 | ext1`
+### C131 · Σ|Δ| 0.9 · 1 certs · `hpcdb17612/gas | cavity wall | pitched 270 | ext1`
 - [ ] `100012753833` · L 74 / E 73.07 / Δ -0.93
 
-### C134 · Σ|Δ| 0.9 · 1 certs · `hpcdb19006/gas | solid brick | pitched 75 | ext1,sec:room heaters`
+### C132 · 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
 
-### C135 · Σ|Δ| 0.9 · 1 certs · `hpcdb17964/gas | cavity wall | pitched insulated | consv3`
+### C133 · Σ|Δ| 0.9 · 1 certs · `hpcdb17964/gas | cavity wall | pitched insulated | consv3`
 - [ ] `200003725358` · L 75 / E 74.09 / Δ -0.91
 
-### C136 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | solid brick | pitched insulated | RR,ext3`
+### C134 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | solid brick | pitched insulated | RR,ext3`
 - [ ] `100050986162` · L 62 / E 61.10 / Δ -0.90
 
-### C137 · Σ|Δ| 0.9 · 1 certs · `hpcdb17985/gas | cavity wall | (another dwelling | mv2`
+### C135 · Σ|Δ| 0.9 · 1 certs · `hpcdb17985/gas | cavity wall | (another dwelling | mv2`
 - [ ] `5300000141` · L 78 / E 77.10 / Δ -0.90
 
-### C138 · Σ|Δ| 0.9 · 1 certs · `hpcdb18616/gas | cavity wall | pitched 250 | sec:room heaters`
+### C136 · Σ|Δ| 0.9 · 1 certs · `hpcdb18616/gas | cavity wall | pitched 250 | sec:room heaters`
 - [ ] `100050618404` · L 73 / E 73.89 / Δ +0.89
 
-### C139 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 250 | PV,ext1`
+### C137 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 250 | PV,ext1`
 - [ ] `100090476016` · L 81 / E 81.89 / Δ +0.89
 
-### C140 · Σ|Δ| 0.9 · 1 certs · `h691/elec | timber frame | pitched 200 | RR,ext3,whw903`
+### C138 · Σ|Δ| 0.9 · 1 certs · `h691/elec | timber frame | pitched 200 | RR,ext3,whw903`
 - [ ] `10012119141` · L 45 / E 45.89 / Δ +0.89
 
-### C141 · Σ|Δ| 0.9 · 1 certs · `h524/elec | cavity wall | pitched 300 | PV`
+### C139 · Σ|Δ| 0.9 · 1 certs · `h524/elec | cavity wall | pitched 300 | PV`
 - [ ] `100040938206` · L 75 / E 75.89 / Δ +0.89
 
-### C142 · Σ|Δ| 0.9 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | RR,consv2`
+### C140 · Σ|Δ| 0.9 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | RR,consv2`
 - [ ] `38188474` · L 76 / E 76.87 / Δ +0.87
 
-### C143 · Σ|Δ| 0.9 · 1 certs · `hpcdb16777/gas | cavity wall | pitched 100 | ext1,sec:room heaters`
+### C141 · 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
 
-### C144 · Σ|Δ| 0.9 · 1 certs · `hpcdb18559/gas+2mains | solid brick | pitched 200 | whw914`
+### C142 · Σ|Δ| 0.9 · 1 certs · `hpcdb18559/gas+2mains | solid brick | pitched 200 | whw914`
 - [ ] `100021236527` · L 72 / E 71.13 / Δ -0.87
 
-### C145 · Σ|Δ| 0.9 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 270 | consv2`
+### C143 · Σ|Δ| 0.9 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 270 | consv2`
 - [ ] `100040193752` · L 71 / E 71.86 / Δ +0.86
 
-### C146 · Σ|Δ| 0.9 · 1 certs · `hpcdb10327/gas | cavity wall | (another dwelling`
+### C144 · Σ|Δ| 0.9 · 1 certs · `hpcdb10327/gas | cavity wall | (another dwelling`
 - [ ] `100060701552` · L 74 / E 74.86 / Δ +0.86
 
-### C147 · Σ|Δ| 0.9 · 1 certs · `h691/elec | system built | flat insulated | whw903`
+### C145 · Σ|Δ| 0.9 · 1 certs · `h691/elec | system built | flat insulated | whw903`
 - [ ] `10070396146` · L 61 / E 60.14 / Δ -0.86
 
-### C148 · Σ|Δ| 0.8 · 1 certs · `hpcdb8587/gas | cavity wall | (another dwelling`
+### C146 · Σ|Δ| 0.8 · 1 certs · `hpcdb8587/gas | cavity wall | (another dwelling`
 - [ ] `100030528930` · L 74 / E 73.16 / Δ -0.84
 
-### C149 · Σ|Δ| 0.8 · 1 certs · `hpcdb18212/gas | solid brick | (another dwelling`
+### C147 · Σ|Δ| 0.8 · 1 certs · `hpcdb18212/gas | solid brick | (another dwelling`
 - [ ] `100020982570` · L 72 / E 71.17 / Δ -0.83
 
-### C150 · Σ|Δ| 0.8 · 1 certs · `hpcdb16888/gas | cavity wall | pitched 350 | consv2`
+### C148 · Σ|Δ| 0.8 · 1 certs · `hpcdb16888/gas | cavity wall | pitched 350 | consv2`
 - [ ] `394024487` · L 75 / E 74.17 / Δ -0.83
 
-### C151 · Σ|Δ| 0.8 · 1 certs · `hpcdb17503/gas | solid brick | pitched insulated | RR,ext1,mv4`
+### C149 · Σ|Δ| 0.8 · 1 certs · `hpcdb17503/gas | solid brick | pitched insulated | RR,ext1,mv4`
 - [ ] `217070698` · L 78 / E 78.83 / Δ +0.83
 
-### C152 · Σ|Δ| 0.8 · 1 certs · `hpcdb15709/gas | cavity wall | (another dwelling | ext1`
+### C150 · Σ|Δ| 0.8 · 1 certs · `hpcdb15709/gas | cavity wall | (another dwelling | ext1`
 - [ ] `77022508` · L 69 / E 68.18 / Δ -0.82
 
-### C153 · Σ|Δ| 0.8 · 1 certs · `hpcdb18496/gas | cavity wall | pitched 250 | RR,consv4`
+### C151 · Σ|Δ| 0.8 · 1 certs · `hpcdb18496/gas | cavity wall | pitched 250 | RR,consv4`
 - [ ] `100040259104` · L 68 / E 68.82 / Δ +0.82
 
-### C154 · Σ|Δ| 0.8 · 1 certs · `hpcdb18559/gas | solid brick | pitched 270 | ext1`
+### C152 · Σ|Δ| 0.8 · 1 certs · `hpcdb18559/gas | solid brick | pitched 270 | ext1`
 - [ ] `100031399026` · L 70 / E 70.81 / Δ +0.81
 
-### C155 · Σ|Δ| 0.8 · 1 certs · `hpcdb16374/gas | cavity wall | pitched unknown`
+### C153 · Σ|Δ| 0.8 · 1 certs · `hpcdb16374/gas | cavity wall | pitched unknown`
 - [ ] `10009645698` · L 67 / E 67.81 / Δ +0.81
 
-### C156 · Σ|Δ| 0.8 · 1 certs · `hpcdb16395/gas | timber frame | thatched with | ext1,sec:room heaters`
+### C154 · 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
 
-### C157 · Σ|Δ| 0.8 · 1 certs · `hpcdb16835/gas | solid brick | pitched insulated | RR,ext1`
+### C155 · Σ|Δ| 0.8 · 1 certs · `hpcdb16835/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `100012374381` · L 69 / E 69.80 / Δ +0.80
 
-### C158 · Σ|Δ| 0.8 · 1 certs · `hpcdb17560/gas | cavity wall | pitched 250 | ext2`
+### C156 · Σ|Δ| 0.8 · 1 certs · `hpcdb17560/gas | cavity wall | pitched 250 | ext2`
 - [ ] `100012350270` · L 78 / E 77.20 / Δ -0.80
 
-### C159 · Σ|Δ| 0.8 · 1 certs · `hpcdb15166/gas+2mains | sandstone as | pitched no | PV,ext4,sec:room heaters,whw914`
+### C157 · 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
 
-### C160 · Σ|Δ| 0.8 · 1 certs · `hpcdb18911/gas | cavity wall | pitched 50 | consv4`
+### C158 · Σ|Δ| 0.8 · 1 certs · `hpcdb18911/gas | cavity wall | pitched 50 | consv4`
 - [ ] `100061616915` · L 63 / E 62.22 / Δ -0.78
 
-### C161 · Σ|Δ| 0.8 · 1 certs · `h691/elec | cavity wall | pitched 200 | whw903`
+### C159 · Σ|Δ| 0.8 · 1 certs · `h691/elec | cavity wall | pitched 200 | whw903`
 - [ ] `line71` · L 74 / E 74.77 / Δ +0.77
 
-### C162 · Σ|Δ| 0.8 · 1 certs · `hpcdb17986/gas | cavity wall | (another dwelling`
+### C160 · Σ|Δ| 0.8 · 1 certs · `hpcdb17986/gas | cavity wall | (another dwelling`
 - [ ] `100011603934` · L 72 / E 71.23 / Δ -0.77
 
-### C163 · Σ|Δ| 0.8 · 1 certs · `hpcdb10244/gas | cavity wall | pitched 100`
+### C161 · Σ|Δ| 0.8 · 1 certs · `hpcdb10244/gas | cavity wall | pitched 100`
 - [ ] `24030987` · L 73 / E 73.76 / Δ +0.76
 
-### C164 · Σ|Δ| 0.8 · 1 certs · `h193/elec | solid brick | (another dwelling | whw909`
+### C162 · Σ|Δ| 0.8 · 1 certs · `h193/elec | solid brick | (another dwelling | whw909`
 - [ ] `100032043038` · L 74 / E 73.24 / Δ -0.76
 
-### C165 · Σ|Δ| 0.8 · 1 certs · `hpcdb17513/gas | cavity wall | pitched unknown`
+### C163 · Σ|Δ| 0.8 · 1 certs · `hpcdb17513/gas | cavity wall | pitched unknown`
 - [ ] `100010866608` · L 71 / E 70.24 / Δ -0.76
 
-### C166 · Σ|Δ| 0.7 · 1 certs · `hpcdb17965/gas | cavity wall | pitched insulated | RR,ext1,sec:room heaters`
+### C164 · 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
 
-### C167 · Σ|Δ| 0.7 · 1 certs · `h691/elec | solid brick | roof room(s) | RR,ext2,sec:room heaters,whw903`
+### C165 · 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
 
-### C168 · Σ|Δ| 0.7 · 1 certs · `hpcdb16137/gas | solid brick | pitched 150`
+### C166 · 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`
+### C167 · Σ|Δ| 0.7 · 1 certs · `hpcdb17576/gas | cavity wall | pitched insulated | RR,consv2`
 - [ ] `10012341135` · L 79 / E 79.73 / Δ +0.73
 
-### C170 · Σ|Δ| 0.7 · 1 certs · `h409/elec | cavity wall | (another dwelling | sec:portable electric,whw903`
+### C168 · 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
 
-### C171 · Σ|Δ| 0.7 · 1 certs · `hpcdb18908/gas | cavity wall | pitched 175`
+### C169 · Σ|Δ| 0.7 · 1 certs · `hpcdb18908/gas | cavity wall | pitched 175`
 - [ ] `100021533514` · L 71 / E 71.73 / Δ +0.73
 
-### C172 · Σ|Δ| 0.7 · 1 certs · `h301/coal-anth | solid brick | (another dwelling`
+### C170 · Σ|Δ| 0.7 · 1 certs · `h301/coal-anth | solid brick | (another dwelling`
 - [ ] `5062075` · L 69 / E 69.72 / Δ +0.72
 
-### C173 · Σ|Δ| 0.7 · 1 certs · `hpcdb18112/gas | cavity wall | pitched 100 | RR,ext1`
+### C171 · Σ|Δ| 0.7 · 1 certs · `hpcdb18112/gas | cavity wall | pitched 100 | RR,ext1`
 - [ ] `100040813308` · L 62 / E 62.72 / Δ +0.72
 
-### C174 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched unknown | ext2`
+### C172 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched unknown | ext2`
 - [ ] `38105600` · L 68 / E 67.28 / Δ -0.72
 
-### C175 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched 200`
+### C173 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched 200`
 - [ ] `line255` · L 72 / E 71.29 / Δ -0.71
 
-### C176 · Σ|Δ| 0.7 · 1 certs · `h304/elec | cavity wall | (another dwelling | whw950`
+### C174 · Σ|Δ| 0.7 · 1 certs · `h304/elec | cavity wall | (another dwelling | whw950`
 - [ ] `5300047580` · L 69 / E 68.30 / Δ -0.70
 
-### C177 · Σ|Δ| 0.7 · 1 certs · `h104/gas | cavity wall | pitched 250 | ext1`
+### C175 · Σ|Δ| 0.7 · 1 certs · `h104/gas | cavity wall | pitched 250 | ext1`
 - [ ] `100110433403` · L 69 / E 68.32 / Δ -0.68
 
-### C178 · Σ|Δ| 0.7 · 1 certs · `hpcdb16835/gas | cavity wall | pitched insulated`
+### C176 · Σ|Δ| 0.7 · 1 certs · `hpcdb16835/gas | cavity wall | pitched insulated`
 - [ ] `10093416558` · L 79 / E 78.32 / Δ -0.68
 
-### C179 · Σ|Δ| 0.7 · 1 certs · `hpcdb18251/gas | solid brick | pitched 100`
+### C177 · Σ|Δ| 0.7 · 1 certs · `hpcdb18251/gas | solid brick | pitched 100`
 - [ ] `100050958217` · L 68 / E 68.68 / Δ +0.68
 
-### C180 · Σ|Δ| 0.7 · 1 certs · `hpcdb18224/gas | solid brick | pitched 225 | ext1`
+### C178 · Σ|Δ| 0.7 · 1 certs · `hpcdb18224/gas | solid brick | pitched 225 | ext1`
 - [ ] `100022667797` · L 68 / E 67.32 / Δ -0.68
 
-### C181 · Σ|Δ| 0.7 · 1 certs · `hpcdb10243/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C179 · 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
 
-### C182 · Σ|Δ| 0.6 · 1 certs · `hpcdb17657/gas | cavity wall | (another dwelling`
+### C180 · Σ|Δ| 0.6 · 1 certs · `hpcdb17657/gas | cavity wall | (another dwelling`
 - [ ] `100110300037` · L 74 / E 73.35 / Δ -0.65
 
-### C183 · Σ|Δ| 0.6 · 1 certs · `hpcdb2044/gas | solid brick | (another dwelling | ext1`
+### C181 · Σ|Δ| 0.6 · 1 certs · `hpcdb2044/gas | solid brick | (another dwelling | ext1`
 - [ ] `217092450` · L 52 / E 52.64 / Δ +0.64
 
-### C184 · Σ|Δ| 0.6 · 1 certs · `hpcdb15101/gas | solid brick | pitched 300`
+### C182 · Σ|Δ| 0.6 · 1 certs · `hpcdb15101/gas | solid brick | pitched 300`
 - [ ] `100061164545` · L 72 / E 71.36 / Δ -0.64
 
-### C185 · Σ|Δ| 0.6 · 1 certs · `hpcdb10328/gas | cavity wall | pitched unknown`
+### C183 · Σ|Δ| 0.6 · 1 certs · `hpcdb10328/gas | cavity wall | pitched unknown`
 - [ ] `100051075936` · L 71 / E 70.36 / Δ -0.64
 
-### C186 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | cavity wall | roof room(s) | RR,sec:room heaters`
+### C184 · 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
 
-### C187 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | sandstone with | pitched 100 | RR,sec:room heaters`
+### C185 · 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
 
-### C188 · Σ|Δ| 0.6 · 1 certs · `hpcdb17115/gas+2mains | cavity wall | pitched insulated | RR,ext4,sec:room heaters`
+### C186 · 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
 
-### C189 · Σ|Δ| 0.6 · 1 certs · `h404/elec | cavity wall | pitched 175 | sec:room heaters,whw909`
+### C187 · 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
 
-### C190 · Σ|Δ| 0.6 · 1 certs · `hpcdb18766/gas+2mains | sandstone as | pitched 100 | RR`
+### C188 · Σ|Δ| 0.6 · 1 certs · `hpcdb18766/gas+2mains | sandstone as | pitched 100 | RR`
 - [ ] `100012534027` · L 65 / E 64.38 / Δ -0.62
 
-### C191 · Σ|Δ| 0.6 · 1 certs · `hpcdb9058/fuel28 | solid brick | pitched 100 | RR,ext2,sec:room heaters`
+### C189 · 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
 
-### C192 · Σ|Δ| 0.6 · 1 certs · `hpcdb18218/gas | solid brick | (another dwelling`
+### C190 · Σ|Δ| 0.6 · 1 certs · `hpcdb18218/gas | solid brick | (another dwelling`
 - [ ] `34080035` · L 77 / E 76.41 / Δ -0.59
 
-### C193 · Σ|Δ| 0.6 · 1 certs · `hpcdb16137/gas | cavity wall | pitched 150 | RR,ext1`
+### C191 · Σ|Δ| 0.6 · 1 certs · `hpcdb16137/gas | cavity wall | pitched 150 | RR,ext1`
 - [ ] `21032732` · L 69 / E 69.59 / Δ +0.59
 
-### C194 · Σ|Δ| 0.6 · 1 certs · `h101/gas | cavity wall | pitched 100 | RR,ext1`
+### C192 · Σ|Δ| 0.6 · 1 certs · `h101/gas | cavity wall | pitched 100 | RR,ext1`
 - [ ] `100060562056` · L 66 / E 65.41 / Δ -0.59
 
-### C195 · Σ|Δ| 0.6 · 1 certs · `hpcdb17514/fuel27 | cavity wall | pitched 400+ | PV,ext2`
+### C193 · Σ|Δ| 0.6 · 1 certs · `hpcdb17514/fuel27 | cavity wall | pitched 400+ | PV,ext2`
 - [ ] `100091086558` · L 79 / E 79.58 / Δ +0.58
 
-### C196 · Σ|Δ| 0.6 · 1 certs · `hpcdb18908/gas | solid brick | (another dwelling`
+### C194 · Σ|Δ| 0.6 · 1 certs · `hpcdb18908/gas | solid brick | (another dwelling`
 - [ ] `line599` · L 74 / E 73.42 / Δ -0.58
 
-### C197 · Σ|Δ| 0.6 · 1 certs · `hpcdb17973/gas | cavity wall | pitched insulated`
+### C195 · Σ|Δ| 0.6 · 1 certs · `hpcdb17973/gas | cavity wall | pitched insulated`
 - [ ] `100020407741` · L 72 / E 71.42 / Δ -0.58
 
-### C198 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | cavity wall | pitched 200 | consv2,ext1,sec:room heaters`
+### C196 · 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
 
-### C199 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,sec:room heaters`
+### C197 · 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
 
-### C200 · Σ|Δ| 0.6 · 1 certs · `hpcdb1917/gas | timber frame | pitched insulated`
+### C198 · Σ|Δ| 0.6 · 1 certs · `hpcdb1917/gas | timber frame | pitched insulated`
 - [ ] `77200509` · L 69 / E 69.57 / Δ +0.57
 
-### C201 · Σ|Δ| 0.6 · 1 certs · `hpcdb10356/gas | cavity wall | pitched insulated | ext2`
+### C199 · 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`
+### C200 · 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`
+### C201 · 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
 
-### C204 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | cavity wall | pitched limited | RR,ext1`
+### C202 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | cavity wall | pitched limited | RR,ext1`
 - [ ] `100100268900` · L 69 / E 69.56 / Δ +0.56
 
-### C205 · Σ|Δ| 0.6 · 1 certs · `hpcdb17004/fuel27+2mains | sandstone as | pitched no | ext3,sec:room heaters`
+### C203 · Σ|Δ| 0.6 · 1 certs · `hpcdb17004/fuel27+2mains | sandstone as | pitched no | ext3,sec:room heaters`
 - [x] `200003110548` · L 29 / E 28.45 / Δ -0.55
 
-### C206 · Σ|Δ| 0.5 · 1 certs · `hpcdb9464/gas | cavity wall | pitched 150 | ext1`
+### C204 · Σ|Δ| 0.5 · 1 certs · `hpcdb9464/gas | cavity wall | pitched 150 | ext1`
 - [ ] `90036914` · L 60 / E 60.55 / Δ +0.55
 
-### C207 · Σ|Δ| 0.5 · 1 certs · `h409/elec | cavity wall | pitched 250 | mv5,sec:room heaters,whw903`
+### C205 · Σ|Δ| 0.5 · 1 certs · `h409/elec | cavity wall | pitched 250 | mv5,sec:room heaters,whw903`
 - [ ] `10004742671` · L 70 / E 69.46 / Δ -0.54
 
-### C208 · Σ|Δ| 0.5 · 1 certs · `hpcdb18251/gas | cavity wall | roof room(s) | RR`
+### C206 · Σ|Δ| 0.5 · 1 certs · `hpcdb18251/gas | cavity wall | roof room(s) | RR`
 - [ ] `100010657450` · L 75 / E 75.54 / Δ +0.54
 
-### C209 · Σ|Δ| 0.5 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 150 | ext1`
+### C207 · Σ|Δ| 0.5 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 150 | ext1`
 - [ ] `100061834344` · L 71 / E 70.46 / Δ -0.54
 
-### C210 · Σ|Δ| 0.5 · 1 certs · `h113/gas | cavity wall | pitched 200`
+### C208 · Σ|Δ| 0.5 · 1 certs · `h113/gas | cavity wall | pitched 200`
 - [ ] `4510097194` · L 70 / E 70.53 / Δ +0.53
 
-### C211 · Σ|Δ| 0.5 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 125 | ext1`
+### C209 · Σ|Δ| 0.5 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 125 | ext1`
 - [ ] `100010913220` · L 72 / E 72.53 / Δ +0.53
 
-### C212 · Σ|Δ| 0.5 · 1 certs · `hpcdb18242/gas | sandstone as | pitched 150 | ext2,sec:room heaters`
+### C210 · Σ|Δ| 0.5 · 1 certs · `hpcdb18242/gas | sandstone as | pitched 150 | ext2,sec:room heaters`
 - [ ] `43074051` · L 63 / E 62.48 / Δ -0.52
 
-### C213 · Σ|Δ| 0.5 · 1 certs · `h104/gas | cavity wall | pitched 300`
+### C211 · Σ|Δ| 0.5 · 1 certs · `h104/gas | cavity wall | pitched 300`
 - [ ] `100010723814` · L 69 / E 69.52 / Δ +0.52
 
-### C214 · Σ|Δ| 0.5 · 1 certs · `hpcdb16137/gas | cavity wall | (another dwelling`
+### C212 · Σ|Δ| 0.5 · 1 certs · `hpcdb16137/gas | cavity wall | (another dwelling`
 - [ ] `100020955792` · L 77 / E 77.52 / Δ +0.52
 
-### C215 · Σ|Δ| 0.5 · 1 certs · `hpcdb19079/gas | cavity wall | pitched 200 | ext1,sec:room heaters`
+### C213 · Σ|Δ| 0.5 · 1 certs · `hpcdb19079/gas | cavity wall | pitched 200 | ext1,sec:room heaters`
 - [ ] `77172223` · L 65 / E 65.52 / Δ +0.52
 
-### C216 · Σ|Δ| 0.5 · 1 certs · `hpcdb10242/gas | granite or | pitched insulated | RR,sec:room heaters`
+### C214 · Σ|Δ| 0.5 · 1 certs · `hpcdb10242/gas | granite or | pitched insulated | RR,sec:room heaters`
 - [ ] `100051245439` · L 62 / E 61.48 / Δ -0.52
 
-### C217 · Σ|Δ| 0.5 · 1 certs · `hpcdb10328/gas | cavity wall | (another dwelling`
+### C215 · Σ|Δ| 0.5 · 1 certs · `hpcdb10328/gas | cavity wall | (another dwelling`
 - [ ] `100012553958` · L 67 / E 66.48 / Δ -0.52
 
-### C218 · Σ|Δ| 0.5 · 1 certs · `hpcdb10033/gas | cavity wall | pitched 200 | ext2,sec:room heaters`
+### C216 · Σ|Δ| 0.5 · 1 certs · `hpcdb10033/gas | cavity wall | pitched 200 | ext2,sec:room heaters`
 - [ ] `100110108632` · L 63 / E 63.51 / Δ +0.51
 
-### C219 · Σ|Δ| 0.5 · 1 certs · `h109/gas | cavity wall | pitched 270 | consv2,ext1,sec:room heaters`
+### C217 · Σ|Δ| 0.5 · 1 certs · `h109/gas | cavity wall | pitched 270 | consv2,ext1,sec:room heaters`
 - [ ] `100091102581` · L 65 / E 65.51 / Δ +0.51
 
-### C220 · Σ|Δ| 0.5 · 1 certs · `hpcdb19008/gas | cavity wall | pitched 150 | ext1,sec:room heaters`
+### C218 · Σ|Δ| 0.5 · 1 certs · `hpcdb19008/gas | cavity wall | pitched 150 | ext1,sec:room heaters`
 - [ ] `10002326688` · L 69 / E 68.50 / Δ -0.50
 
-### C221 · Σ|Δ| 0.5 · 1 certs · `h129/fuel28 | granite or | pitched 200 | ext2,sec:room heaters`
+### C219 · Σ|Δ| 0.5 · 1 certs · `h129/fuel28 | granite or | pitched 200 | ext2,sec:room heaters`
 - [ ] `10023132869` · L 46 / E 45.50 / Δ -0.50
 
-### C222 · Σ|Δ| 0.5 · 1 certs · `hpcdb9007/fuel28 | sandstone as | pitched insulated | RR,ext4,sec:room heaters`
+### C220 · Σ|Δ| 0.5 · 1 certs · `hpcdb9007/fuel28 | sandstone as | pitched insulated | RR,ext4,sec:room heaters`
 - [ ] `10091707271` · L 41 / E 41.50 / Δ +0.50
 
-## Resolved ≤0.5 (770 certs — no action)
+## Resolved ≤0.5 (773 certs — no action)
 
 <details><summary>expand</summary>
 
@@ -841,6 +834,7 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [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] `200004017091` · L 71 / E 71.39 / Δ +0.39 · `hpcdb17803/gas | timber frame | pitched 100`
 - [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`
 - [x] `100022887979` · L 72 / E 72.39 / Δ +0.39 · `hpcdb18861/gas | solid brick | (another dwelling`
@@ -1185,6 +1179,7 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [x] `100010043608` · L 56 / E 56.16 / Δ +0.16 · `h401/elec | cavity wall | pitched 200 | PV,RR,consv2,ext1,sec:room heaters,whw903`
 - [x] `100022232588` · L 56 / E 56.16 / Δ +0.16 · `h102/gas | solid brick | pitched 25 | ext1`
 - [x] `100110450961` · L 69 / E 68.84 / Δ -0.16 · `h104/gas | sandstone as | pitched 250 | ext1`
+- [x] `11071248` · L 78 / E 77.84 / Δ -0.16 · `h402/elec | solid brick | (another dwelling | sec:portable electric,whw903`
 - [x] `10014540481` · L 81 / E 81.15 / Δ +0.15 · `hpcdb16400/gas | timber frame | roof room(s) | RR`
 - [x] `100061860491` · L 69 / E 68.85 / Δ -0.15 · `hpcdb18824/gas | cavity wall | pitched 250 | consv3`
 - [x] `100121065133` · L 81 / E 80.85 / Δ -0.15 · `hpcdb17511/gas | cavity wall | (another dwelling`
@@ -1248,6 +1243,7 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [x] `202028377` · L 66 / E 66.13 / Δ +0.13 · `hpcdb17548/gas | solid brick | pitched 75`
 - [x] `100090533643` · L 85 / E 85.13 / Δ +0.13 · `hpcdb17507/gas | cavity wall | pitched insulated | PV,ext1`
 - [x] `100090335261` · L 70 / E 70.13 / Δ +0.13 · `hpcdb17974/gas | cavity wall | (another dwelling`
+- [x] `100050048691` · L 58 / E 57.87 / Δ -0.13 · `hpcdb18991/fuel28 | solid brick | pitched 250 | sec:room heaters`
 - [x] `100061898123` · L 70 / E 70.13 / Δ +0.13 · `hpcdb17511/gas | solid brick | pitched 100`
 - [x] `38149813` · L 74 / E 73.87 / Δ -0.13 · `h104/gas | solid brick | pitched 350 | ext1`
 - [x] `10014619006` · L 77 / E 77.13 / Δ +0.13 · `hpcdb17045/gas | cavity wall | pitched 350 | mv2`
diff --git a/tests/domain/sap10_calculator/rdsap/test_cert_to_inputs.py b/tests/domain/sap10_calculator/rdsap/test_cert_to_inputs.py
index ded178ade..d6a3c1cdc 100644
--- a/tests/domain/sap10_calculator/rdsap/test_cert_to_inputs.py
+++ b/tests/domain/sap10_calculator/rdsap/test_cert_to_inputs.py
@@ -738,6 +738,30 @@ def test_cylinder_present_but_size_not_determined_defaults_to_normal_110l() -> N
     assert volume_l is not None and abs(volume_l - 110.0) <= 1e-9
 
 
+def test_cylinder_size_not_determined_still_incurs_storage_loss() -> None:
+    # Arrange — the size-0 (not determined) cylinder's Table 28 default of
+    # 110 L must flow into the STORAGE-LOSS override too, not just the Table
+    # 13 high-rate fraction. `_cylinder_storage_loss_override` read the
+    # volume via `_cylinder_volume_l_from_code` (None for size 0) and bailed
+    # `if volume_l is None: return None`, dropping the loss entirely — while
+    # the rest of the DHW cascade used `_hot_water_cylinder_volume_l`
+    # (110 L). A present cylinder with no storage loss under-costs the DHW
+    # and over-rates the dwelling (7 corpus certs lodge cylinder_size=0 +
+    # has_cylinder=true). RdSAP 10 §10.5 Table 28: a present-but-unsized
+    # cylinder is a 110 L cylinder and incurs the Table 2 storage loss.
+    from domain.sap10_calculator.rdsap.cert_to_inputs import (
+        _cylinder_storage_loss_override,  # pyright: ignore[reportPrivateUsage]
+    )
+    epc = _cylinder_epc(cylinder_size=0)
+
+    # Act
+    storage_56m = _cylinder_storage_loss_override(epc, None)
+
+    # Assert — a real 110 L cylinder loss series, not the dropped None.
+    assert storage_56m is not None
+    assert sum(storage_56m) > 0.0
+
+
 def test_cylinder_size_inaccessible_code_5_solid_fuel_boiler_uses_160l() -> None:
     # Arrange — RdSAP 10 §10.5 Table 28: an "Inaccessible" cylinder (code 5)
     # heated "from a solid fuel boiler" uses 160 litres.
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 d7e22cd64..e63d946bf 100644
--- a/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
+++ b/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
@@ -790,6 +790,21 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
         cert_num="uprn-200004296092",
         sap_score=72,
     ),
+    # UPRN 200004017091 (corpus; no cert number lodged). RdSAP-21.0.1 native —
+    # END-TERRACE HOUSE, mains-gas boiler, hot-water cylinder lodged with
+    # `cylinder_size=0` (present but "size not determined") + has_cylinder=true.
+    # The unsized-cylinder storage-loss cert: `_cylinder_storage_loss_override`
+    # read the volume via `_cylinder_volume_l_from_code` → None for size 0 →
+    # bailed and DROPPED the cylinder's Table-2 storage loss, under-costing the
+    # DHW → engine 72.75 (Δ +1.75 vs lodged 71). RdSAP 10 §10.5 Table 28: an
+    # unsized present cylinder is the 110 L "Normal" default and still incurs
+    # the loss → engine 71.39 = lodged 71. PINNED to the observed engine 71.
+    RealCertExpectation(
+        schema="RdSAP-Schema-21.0.1",
+        sample="uprn_200004017091",
+        cert_num="uprn-200004017091",
+        sap_score=71,
+    ),
 )
 
 
diff --git a/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py b/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
index 36ea16c3a..197e6f7e0 100644
--- a/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
+++ b/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
@@ -218,7 +218,16 @@ _CORPUS = Path(
 # lodged 36 / engine 20.8 -> 35.9. 55 corpus certs carry a colliding
 # secondary. Unit-pinned in test_cert_to_inputs (fuel_cost cost path, not
 # just the display helper the prior enum-9 test guarded).
-_MIN_WITHIN_HALF_SAP = 0.770
+# 0.770 -> 0.773 via the unsized-cylinder storage-loss fix: a present
+# cylinder lodging gov-API cylinder_size=0 ("size not determined") resolved
+# to None volume in `_cylinder_storage_loss_override`, so `if volume_l is
+# None: return None` DROPPED its storage loss (under-costing the DHW ->
+# over-rate). RdSAP 10 §10.5 Table 28: an unsized present cylinder is the
+# 110 L "Normal" default and still incurs the Table-2 loss (the value the
+# Table-13 fraction path already used). Gated on the explicit 0 so a
+# full-SAP unlodged size (None) keeps its own handling. 7 corpus certs;
+# within 77.0% -> 77.3%, PE 3.2 -> 3.05, CO2 0.074 -> 0.073.
+_MIN_WITHIN_HALF_SAP = 0.773
 # 0.793 -> 0.789 via the §12 Unknown-meter + dual-electric-immersion off-peak
 # trigger (RdSAP 10 PDF p.62): Apartment 241 (main 691 + 903 dual immersion)
 # -5.38 -> -1.05. Worksheet-validated on "simulated case 48" (Elmhurst SAP 57,
@@ -305,8 +314,8 @@ _MIN_WITHIN_HALF_SAP = 0.770
 # 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
+_MAX_CO2_MAE_TONNES = 0.074     # t CO2 / yr vs co2_emissions_current
+_MAX_PE_PER_M2_MAE = 3.1        # kWh / m2 / yr vs energy_consumption_current
 
 
 def _load_corpus() -> list[dict[str, Any]]: