Looking at the biggest 'Menhir', and seeing the lamp post on the left, I'd say these were pretty big stones, possibly about half a ton to a ton each. I'm thinking Rugby club here. Or Kevin McCloud and a horde of Neolithic people, wittering on about 'integrity'...
This picture just made me dig through several thousand mp3 files to find 'Cherry Blossom', a surprisingly tender song by the normally brutalist electronica band Nitzer Ebb. (still quite loud though).😘😘😘