diff --git a/tests/domain/epc/test_main_fuel_overlay.py b/tests/domain/epc/test_main_fuel_overlay.py
index 96072c1d..f3cf0007 100644
--- a/tests/domain/epc/test_main_fuel_overlay.py
+++ b/tests/domain/epc/test_main_fuel_overlay.py
@@ -6,6 +6,8 @@ reads from the dwelling's primary heating system; the overlay is whole-dwelling.
 
 from __future__ import annotations
 
+import pytest
+
 from domain.epc.property_overlays.main_fuel_overlay import fuel_overlay_for
 
 
@@ -17,3 +19,24 @@ def test_mains_gas_overlays_the_primary_fuel() -> None:
     assert simulation is not None
     assert simulation.heating is not None
     assert simulation.heating.main_fuel_type == 26
+
+
+@pytest.mark.parametrize(
+    ("main_fuel_value", "code"),
+    [
+        ("electricity", 29),
+        ("LPG (bulk)", 27),
+        ("oil", 28),
+        ("house coal", 33),
+    ],
+)
+def test_fuels_decode_to_their_modern_not_community_codes(
+    main_fuel_value: str, code: int
+) -> None:
+    # Act
+    simulation = fuel_overlay_for(main_fuel_value, 0)
+
+    # Assert
+    assert simulation is not None
+    assert simulation.heating is not None
+    assert simulation.heating.main_fuel_type == code