Funny Lingus brought next idea :
Question: Does the team think that putting the heaters behind the doors would
have any detrimental effect on heat distribution. All the storage heaters are
under windows at the moment, so immediately lose a huge amount of heat,
although double glazed.

Heat sources under windows in the conventional place to have them,
because it counteracts the cold draft resulting from cooled air falling
down a window. Rooms with two windows will likely have two radiators,
for the same reason. Blown air heating always has the air outlets under
windows.

Heating is not nearly as effective, if radiators are mounted at other
locations in a room.