Still don't know what it is but the circle looks like it could be concrete. Pulse jet cars maybe? Horses? Heres an improved picture. Johns still a bit secretive.
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John, as this is situated in the middle of no-where, on the coast/marsh land near Stiffkey, north Norfalk. I would think it is something to do with gunnery training. Maybe a round the pole flying target.
Thats a brilliant invention, only better by the device that released the drone at the right place in the circle!!!! What period is this from, 1950's 60's or so??