Hhmmm....Very interesting...Based upon four years on the F-111, I dare say that outline looks waaaayyy too much like an F-111, especially the large vertical stab. There is a 'bulge' under the shape that seems practically identify the position of the F-111's main landing gear. The trees are barren of leaves and the rest of the pix seems to indicate a typical English fall morning: cold, foggy, and wet. At RAF Upper Heyford, the base is separated by a public highway, aka 'Queens Road'. The flightline, aircraft support, and weapons depot are on one side, base housing and wing support facilities on the other and is quite open. Anybody could stroll straight in. Only the flightline is fenced and guarded. This picture looks like it was from the road at end-of-runway (EOR) where an F-111 would have a final inspection before take-off.
At EOR and outside of the base proper, there was a camp composed of 1960s leftover peacenik members of Campaign for Nuclear Disarmament (CND). We call them 'CNDers' and many Americans who drove by the camp would roll down their windows and blast out Black Sabbath's 'War Pigs', never mind that it was supposedly an anti-war song...
...There was a lady, looked like in her late 50s back then, who everyday stood by the wire fence, like one clearly in the pix above, with closed eyes in prayer -- for hours and even in the snow. Guess her prayers worked because the Soviet Union collapsed...