I always thought that the remains of the Manton longbarrow were in the hedgerow near to the original site. I found what I believed to be the capstone etc. As far as Clatford goes, I couldnt make out anything from the ariel shot whatsoever, I thought the circle was located near to the Kennet. There is a stone on the right as you go from Clatford towards the A4 - just over the bridge and near to the river. There are a load of stones in a vaguely circular shape nearby down a lane from Clatford to the A4...