The houses in the background of the first picture would possibly indicate it is parked near Whelpley Hill, but this is nowhere near the end of the main runway; it is however near the end of runway 28 which is shorter. On the other hand, if the fence in the background denotes the main road to Chesham rather than Whelpley Hill, then it could be the large parking area at the southern end of the disused north/south runway which if I recall, was the main USAF pan up to '62, and the main parking area for the comms sqdn aircraft after the merger of FCCS, CCCS and BCCS (which moved in from Booker when it closed as an RAF airfield).