Update Thursday 18h July 1996
Silverstone, Northamptonshire. Reported 14th July.
There are some circles and a rough crucifix formation in a field just north-east of the racing circuit and west of the village of Whittlebury. There is a photograph of them so you can see the shapes, just In case someone else reports them. Looks like someone may be practising for something.
From what I can see they are totally invisible from any road, but very close to a footpath crossing the field.
Reported by Russell Stannard.

Image by Russell Stannard. Copyright 1996.