Rural area, near RAF Great Rissington, Gloucestershire, U.K.I was an avid plane spotter, was watching out for planes, with binoculars.
This was an area frequented by test planes and many U.S.A.F. bombers.
I think I saw the U2 at extreme altitude before it got any publicity.
That day, one circular saucer rose above hilly wooded horizon, about 2 miles away, edge on, travelling not very fast in a horizontal plane.
Then banked away, clearly spinning, about 50-60 rpm, I'd guess.
Rose a little above the horizon, then fell away below horizon.
To be followed by 8 more in line astern.
I had the binoculars on it/them in turn, and I can't remember if there were 2 visible at any one time, but the timing and motion was such that it would be highly unlikely if it were one repeating the manoeuvre another 8 times.
Color was aluminium grey, diameter of about 30', I'd guess, at that distance it was difficult to tell.
I didn't get a long look edge on but I think I glimpsed a bulge at the center.
Have spoken about this for years and, of course, everyone dismisses it.
Got my Dad to report it to R.A.F., but, you know the rest.