I've just spent the week in the area and visited the Tor a couple of times. There's a large irregular stone in the foundations of the tower. It looks very much like a true megalith and likely to be considering what they did at the time to try to Christianise sacred sites. There's a couple of fossils in the stone too (a shell and an ammonite), again evidence for it being used as a sacred stone! What do you think?!
Something is not right. This message is just to keep things from messing up down the road