Thanks for all the replies to the 'some help please' topic that I posted yesterday. Unfortunately I still haven't found what I am looking for.

The dolmen/cromlech that I am looking for has an enormous capstone similar to that of Carreg Samson in Pembroke, it may even be slightly bigger. The dolmen itself appears to be in front of a large white radar dish that may be a radar installation or, as is more likely, a radar telescope. It is also near to what appears to be a lake or the sea.

Any further ideas would be most gratefully received.