diff --git a/src/CSET/operators/read.py b/src/CSET/operators/read.py
index 6c30af1e7..775e0b115 100644
--- a/src/CSET/operators/read.py
+++ b/src/CSET/operators/read.py
@@ -373,7 +373,7 @@ def _loading_callback(cube: iris.cube.Cube, field, filename: str) -> iris.cube.C
     _fix_lfric_cloud_base_altitude(cube)
     _proleptic_gregorian_fix(cube)
     _lfric_time_callback(cube)
-    _lfric_forecast_period_standard_name_callback(cube)
+    _lfric_forecast_period_callback(cube)
     return cube
 
 
@@ -430,6 +430,9 @@ def _lfric_normalise_callback(cube: iris.cube.Cube, field, filename):
     cube.attributes.pop("timeStamp", None)
     cube.attributes.pop("uuid", None)
     cube.attributes.pop("name", None)
+    cube.attributes.pop("source", None)
+    cube.attributes.pop("analysis_source", None)
+    cube.attributes.pop("history", None)
 
     # Sort STASH code list.
     stash_list = cube.attributes.get("um_stash_source")
@@ -964,10 +967,12 @@ def _lfric_time_callback(cube: iris.cube.Cube):
         logging.warning("No time coordinate on cube.")
 
 
-def _lfric_forecast_period_standard_name_callback(cube: iris.cube.Cube):
-    """Add forecast_period standard name if missing."""
+def _lfric_forecast_period_callback(cube: iris.cube.Cube):
+    """Check forecast_period name and units."""
     try:
         coord = cube.coord("forecast_period")
+        if coord.units != "hours":
+            cube.coord("forecast_period").convert_units("hours")
         if not coord.standard_name:
             coord.standard_name = "forecast_period"
     except iris.exceptions.CoordinateNotFoundError:
diff --git a/tests/operators/test_read.py b/tests/operators/test_read.py
index 716362ee8..a9a7ebcfa 100644
--- a/tests/operators/test_read.py
+++ b/tests/operators/test_read.py
@@ -788,10 +788,18 @@ def test_normalise_var0_varname(model_level_cube):
 def test_lfric_forecast_period_standard_name_callback(cube):
     """Ensure forecast period coordinates have a standard name."""
     cube.coord("forecast_period").standard_name = None
-    read._lfric_forecast_period_standard_name_callback(cube)
+    read._lfric_forecast_period_callback(cube)
     assert cube.coord("forecast_period").standard_name == "forecast_period"
 
 
+def test_lfric_forecast_period_convert_units_callback(cube):
+    """Ensure forecast period coordinates have a standard name."""
+    cube.coord("forecast_period").convert_units("seconds")
+    assert cube.coord("forecast_period").units == "seconds"
+    read._lfric_forecast_period_callback(cube)
+    assert cube.coord("forecast_period").units == "hours"
+
+
 def test_read_cubes_extract_cells():
     """Read cube and ensure appropriate number of cells are trimmed from domain edges."""
     cube = read.read_cubes(