My thanks to Howard for supplying the text and pictures on this page.
He writes, "These four photos are of the Tre’r Dryw Bach group on Anglesey. I reckon there is a typo in your information and that the map reference is SH463668 and not SH468673 (this will get corrected on th enext release of the Megalith Map). This can be confirmed by looking at the appropriate OS map. There are only two stones left in this group and they form part of a hedge boundary between two fields. They are large interesting stones so I have included two photos of them as a pair and two showing them individually. As we approached these stones, a young lad came out from the near by farm to confirm that they were indeed the stone circle, as shown on the map.