I went today. Couldn't see anything, just a multi-acre flat ploughed field, with no sign of where they dug. Bredon Hill looms in the background though. Some worked flint, and enough chunks of local ploughed out boulders in the hedgerows to make you wonder.
Google seems to think there may have been other henges in the Bredon area, and there was certainly quite a neolithic hotspot in the locality, so up yours Wilts!