diff --git a/backend/documents_parser/tests/test_extractor.py b/backend/documents_parser/tests/test_extractor.py
index be577f1bf..438c8a74d 100644
--- a/backend/documents_parser/tests/test_extractor.py
+++ b/backend/documents_parser/tests/test_extractor.py
@@ -537,6 +537,44 @@ class TestHeatingAndHotWater:
         )
 
 
+class TestMainHeatingFuelLabelVariant:
+    """The newer PAS Hub site-note form lodges the main-heating fuel under a
+    `Fuel:` label (with colon) rather than the usual `Fuel`. The extractor must
+    recognise both, else the fuel is silently dropped and the property presents
+    as fuel-less downstream — the 3 Guinness cohort "blank-fuel" residuals that
+    were really Mains Gas all along (issue #1558)."""
+
+    def _section(self, fuel_label: str) -> list[str]:
+        return [
+            "Heating & Hot Water",
+            "System type:",
+            "Boiler with radiators or underfloor heating",
+            fuel_label,
+            "Mains Gas",
+            "Ventilation",
+        ]
+
+    def test_colon_fuel_label_captures_value(self) -> None:
+        # Arrange
+        tokens = self._section("Fuel:")
+
+        # Act
+        hhw = PasHubRdSapSiteNotesExtractor(tokens).extract_heating_and_hot_water()
+
+        # Assert
+        assert hhw.main_heating.fuel == "Mains Gas"
+
+    def test_plain_fuel_label_still_captures_value(self) -> None:
+        # Arrange
+        tokens = self._section("Fuel")
+
+        # Act
+        hhw = PasHubRdSapSiteNotesExtractor(tokens).extract_heating_and_hot_water()
+
+        # Assert
+        assert hhw.main_heating.fuel == "Mains Gas"
+
+
 class TestVentilation:
     @pytest.fixture
     def ventilation(self) -> Ventilation: