Kilfinan

What a very interesting stone George. Some of the angles are quite a good match with Maen Llia, and the bottom right incline matches the latitude of the site? ( best as I can tell from this photo)

Any info on it's orientation?

Glad you mention it's Maen Llia'ness, I said the same thing when I went two and a half years ago, I think its on a north-south orientation

Looks like one of the Avenue stones at Avebury.

If it's North/South as you say Postie, it's even more Maen Llia like. Very curious !