Forgot about 5AEF which is daft as I used to go to 5AEF as a cadet in the 70s/80s and later as escorting staff, and while labelled as Cambridge Airport, you got a sense it was Marshalls private airfield. I don't ever recall every seeing anything move at the weekends other than the Chippies and Huskey. We'd go for little wanders and peek in some of the hangars.
So it seems we could easily ditch the reliance on using RAF Out in the Sticks and use civil fields, which would have to be cheaper in the long run and they could close / sell off airfield part for houses. If the flying gets binned / delayed you aren't too far from real places and maybe visits to parts of the airport as opposed being bored rigid in RAF Back of Beyond. Maybe 5 AEF could go back to Cambridge.