diff --git a/tests/orchestration/test_bulk_upload_finaliser_orchestrator.py b/tests/orchestration/test_bulk_upload_finaliser_orchestrator.py
index 335a3e919..3ce8b8dcc 100644
--- a/tests/orchestration/test_bulk_upload_finaliser_orchestrator.py
+++ b/tests/orchestration/test_bulk_upload_finaliser_orchestrator.py
@@ -232,6 +232,75 @@ def test_finalise_writes_overrides_for_uprn_rows_splitting_by_part() -> None:
     assert (prop_type.building_part, prop_type.override_value) == (0, "Semi-detached house")
 
 
+def test_finalise_writes_the_boiler_efficiency_band_alongside_the_heating_system() -> None:
+    # The band rides the SAME "Heating" source column as main_heating_system
+    # (like Property Type feeds property_type + built_form), so a banded boiler
+    # cell yields two override rows: the archetype and its SEDBUK band (ADR-0068).
+    combiner = [{"address2uprn_uprn": "100023", "source_row_id": "row-a"}]
+    classifier = [{"Heating": "Boiler: D rated Regular Boiler", "source_row_id": "row-a"}]
+    vocab = {
+        "main_heating_system": {"boiler: d rated regular boiler": "Gas boiler, regular"},
+        "boiler_efficiency_band": {"boiler: d rated regular boiler": "D"},
+    }
+    orchestrator, overrides = _overrides_orchestrator({100023: 555}, vocab)
+
+    orchestrator.finalise(
+        combiner,
+        portfolio_id=7,
+        task_id=uuid4(),
+        classifier_rows=classifier,
+        multi_entry_ordering={},
+        column_mapping={
+            "main_heating_system": "Heating",
+            "boiler_efficiency_band": "Heating",
+        },
+    )
+
+    (band,) = [
+        o for o in overrides.upserted if o.override_component == "boiler_efficiency_band"
+    ]
+    assert (band.building_part, band.override_value) == (0, "D")
+
+
+def test_finalise_skips_an_unknown_boiler_efficiency_band_without_failing() -> None:
+    # A non-boiler heating system (or a plain boiler) carries no band, so the band
+    # classifier returns UNKNOWN. Unlike the mandatory components, an UNKNOWN band
+    # is a legitimate "no value" — skip it, don't fail the finalise (ADR-0068).
+    combiner = [{"address2uprn_uprn": "100023", "source_row_id": "row-a"}]
+    classifier = [
+        {"Heating": "Community Heating Systems: Community boilers only (RdSAP)",
+         "source_row_id": "row-a"}
+    ]
+    vocab = {
+        "main_heating_system": {
+            "community heating systems: community boilers only (rdsap)":
+                "Community heating, boilers"
+        },
+        "boiler_efficiency_band": {
+            "community heating systems: community boilers only (rdsap)": "Unknown"
+        },
+    }
+    orchestrator, overrides = _overrides_orchestrator({100023: 555}, vocab)
+
+    orchestrator.finalise(
+        combiner,
+        portfolio_id=7,
+        task_id=uuid4(),
+        classifier_rows=classifier,
+        multi_entry_ordering={},
+        column_mapping={
+            "main_heating_system": "Heating",
+            "boiler_efficiency_band": "Heating",
+        },
+    )
+
+    # The heating system row is written; the UNKNOWN band produced no row.
+    assert any(o.override_component == "main_heating_system" for o in overrides.upserted)
+    assert not any(
+        o.override_component == "boiler_efficiency_band" for o in overrides.upserted
+    )
+
+
 def test_finalise_fails_loudly_on_unresolved_description() -> None:
     combiner = [
         {"address2uprn_uprn": "100023", "source_row_id": "row-a"},