My mother was born in Pitstone, about half a mile east of Cheddington.
Post war there was a large amount of construction work along the previously barren eastern boundary. Myself and some mates went to explore in about 1968 ish in spite of the 'MOD Property' signs and were met with people in uniform demanding to know what we were doing there. Just east of the eastern boundary you can see the terraces of a small hill and local rumour was that it was CIA with some tunnels built into the hill hiding some sort of clandestine ammunition.
The old south east taxiway is now a private airstrip.