Well hauling another book out Nicholas Thomas Guide to Prehistoric England, this comes out on Coldrum, and does'nt seem to be mentioned on the thread (but sorry if I missed it) to quote..
"A line of 5 recumbent sarsens can be seen in the field of Coldrum Farm, orientated N/S. Though never examined by excavation, presumed to be set up in association with the chambered longbarrow"