Hi, AM (Great monica but don't get peps on this site talking about sheep!). Re stone, it didn't have the "feel" of being mediaeval. There were no obvious signs of it being worked apart from the obvious crosses and perhaps the top. In my field notes I mention that perhaps the local stone naturally cleaves into this sort of shape. There's no church nearby and the crossroads seen pretty ordinary to me. The stone doesn't command any particular heights, the ground just rises gently to the W. and a little more steeply to a stream valley on the E.
This area of Devon is a bit of a desert for TMA sites.