diff --git a/applications/modelling_e2e/handler.py b/applications/modelling_e2e/handler.py
index 916c2c247..b4848f694 100644
--- a/applications/modelling_e2e/handler.py
+++ b/applications/modelling_e2e/handler.py
@@ -108,7 +108,10 @@ from repositories.product.composite_product_repository import (
 from repositories.property.in_memory_property_overrides_reader import (
     InMemoryPropertyOverridesReader,
 )
-from repositories.property.landlord_override_overlays import overlays_from
+from repositories.property.landlord_override_overlays import (
+    flag_fuel_mismatch,
+    overlays_from,
+)
 from repositories.property.override_backed_prediction_attributes_reader import (
     OverrideBackedPredictionAttributesReader,
 )
@@ -561,7 +564,9 @@ def handler(
                 epc = (
                     None  # no stored lodged EPC; prediction path handles this property
                 )
-            overrides = overlays_from(overrides_reader.overrides_for(pid))
+            resolved_overrides = overrides_reader.overrides_for(pid)
+            flag_fuel_mismatch(resolved_overrides)
+            overrides = overlays_from(resolved_overrides)
             predicted_epc: Optional[EpcPropertyData] = None
             predicted_epc_is_new = False
 
diff --git a/repositories/property/property_postgres_repository.py b/repositories/property/property_postgres_repository.py
index dec92814e..1072c18d8 100644
--- a/repositories/property/property_postgres_repository.py
+++ b/repositories/property/property_postgres_repository.py
@@ -14,7 +14,10 @@ from domain.property.properties import Properties
 from domain.property.property import Property, PropertyIdentity
 from infrastructure.postgres.property_table import PropertyRow
 from repositories.epc.epc_repository import EpcRepository
-from repositories.property.landlord_override_overlays import overlays_from
+from repositories.property.landlord_override_overlays import (
+    flag_fuel_mismatch,
+    overlays_from,
+)
 from repositories.property.property_overrides_reader import PropertyOverridesReader
 from repositories.property.property_repository import (
     PropertyIdentityInsert,
@@ -63,7 +66,9 @@ class PropertyPostgresRepository(PropertyRepository):
         no reader is wired (the overlay stays off) or the Property has none."""
         if self._overrides_reader is None:
             return []
-        return overlays_from(self._overrides_reader.overrides_for(property_id))
+        overrides = self._overrides_reader.overrides_for(property_id)
+        flag_fuel_mismatch(overrides)
+        return overlays_from(overrides)
 
     def get(self, property_id: int) -> Property:
         row = self._session.get(PropertyRow, property_id)