For those who would like to follow up the recent discussion, I would suggest the following: Fleming, A., 2008, The Dartmoor Reaves: Investigating Prehistoric Land Divisions, Windgather Press and: Newman, P., 2002, Headland Warren and the Birch Tor & Vitifer Tin Mines, Archaeological Investigation Report Series AI/34/2002, English Heritage. The latter of these two publications is a particularly fine piece of work. Trevor