There are a few threads on here about locations of RAF Stations, often with evidence of sites which are gradually disappearing.
There is an overlay for Google Earth which purports to show all the RAF Sites there have been and it doesn't just contain airfields, but everything from Arms Dumps to Chain Home Low Sites. It's not perfect, and I sometimes find the locations aren't quite right (R3 bunkers for example).
It can be found here:
RAF Stations On Google Earth
Of course this assumes you have Google Earth in the first place, but it's free and well worth the effort IMHO.
I know that's getting you no nearer the answer, but both sites mentioned above are in the overlay.
STH