Hi Steve611,
Two extra thoughts to add the ever increasing lists of suggestions.

Amberley Chalk Pits Museum (don’t laugh!) in west Sussex. There is a small dedicated aviation section within their larger radio / wireless / TV history building. Frequently has a ‘technical gent’ beavering away in the a radio shack. Collection includes a partial Lancaster replica bulkhead / frame that holds appropiate communications equipment.

Next, I think I recall a group using one of the small buildings near the V1 ski slope on Duxford airfield. They had an interesting display – but I cannot remember any details at some distance.