I was quite impressed by this, but then anything like this impresses me!
The ditch and remains of two raised banks either side of it were clearly evident. There also appeared to be an 'entrance' to the enclosure in the middle of the ring.
The track probabley cut the circle in two, if it was a circle, which seems likely to me. The field opposite must've been worked enough in the past to leave little trace of it discernable to my untrained eye.