The "craft" I sighted was powered and it moved as though under precise guidance at an estimated speed of well over a 1,000 mph.Lying on my sun lounger in back yard. Looked up and saw a shape. First of all I thought it was seedpod or something floating on the breeze 10 to 15 feet up but on focussing properly I realised it was at least as high as any passenger planes 30 to 40,000 feet up. It was a silver "craft" comparitive in size to an airliner consisting of three equal arms around a small centre. It rotated every 2-3 seconds while travelling at speed 3 to 4 times that of airliners ( I live below a busy flightpath in central England)I leapt out of my sun lounger and watched the object disappear out of view after about another 7 seconds. I am a natural sceptic and I'm also very interested in 'real' science and I have neither seen or heard of anything like the thing I saw but I know what I saw. I was at once fascinated, amazed and excited. It was real.I kept quiet about it until today even scanning my local newspaper for any report of the sighting but there was nothing. It wasn't a cloud formation because it was a beautiful clear day. It wasn't a fancy weather ballon or a child's kite it was powered and it was guided. I do hope somebody else saw it too but I am not afraid to tell of my sighting. I am absolutely confident that I saw something remarkable.((NUFORC Note: Witness describes self as having considerable technical background. PD))