Hello Mr Hunter,
I know what you mean about the Hanging Stones in your field notes, I thought exactly the same. However, I'm a little more convinced about their antiquity these days, mainly because of Fitz's post
http://www.themodernantiquarian.com/post/17261
& in PRAoWR they state, "W end was turf covered, until stripped for quarrying in the 19th century" & the sharp carving is at the west end.