I went back there again today and found the circle, have to say it looks rubbish from the ground, nothing strange happened to me. In my opinion it was man made, the rape seed plants just look flattened and snapped off at ground level, not bent just about ground level as I've heard of before.
It was on top the hill next to the barrow so there was no way you could see it unless you were in the air, the only reason I found it was that some people were in it so I went to see what they were doing
Tookj some more pics for you all, just need to load them up somewhere