Without going on the Bluestone trip too much (Bedd Arthur overlooks Carn Meini, the alleged Stonehenge bluestone etc etc), it’s interesting that Bedd Arthur is a horseshoe shape, as in the inner Stonehenge ring.
But it’s possible this site isn’t that old...there’s no date on it, and Burl doesn’t list it in my copy of his guide.
Nice place to stop by though, if you’re passing.
RG