What an absolute whopper! Can't believe no-one's posted pictures before now. Park by the house and ask permission (no-one was in when we went).
With Bwlch Mawr in one direction and Mynydd Graig Goch in the other, it occupies a great position despite the nearby farmhouse, quarry and tall antenna. The two cairns are close too, just the other side of a fence. What a great stone!