I was always under the impression that this video had been proven fake, but it seems the debate is still alive and well, well judging from the information about it around the place.
The video shot in 1996 by John Wheyleigh shows a few orb objects floating over a field which appear to make a crop circle.
It actually does look pretty authentic, the video is of low quality, but for me it doesn't have the computer generated feel to it and coming from 1996, if it is CG then it's very well done.
Oliver's Castle Crop Circle Video