I was sitting at my desk looking out of an first floor window when i noticed a movement at a row of hedges about 200 feet away. there was a grey shape, about a meter long, half meter deep, rectangular, moving in front of the hedge, about 30 feet from the ground. i could clearly see under it and above it, it moved left to right and vanished after moving approx 10 feet. other people living in the area have seen lights at night in the same place. there is only waste land beyond the hedge, got no idea what it was.