4842's the one. As it spreads over two fields, is partly under a railwayline and I'm superstitious about making measurements the diameter is only estimated. It's in the range of the sixth, seventh or eighth largest circle known. I'm going to find a copy of a 6" OS soon and will make a simple copy. It's a double circle - maybe 2 megalithic yards between inner and outer - and has a 'cigar-shaped enclosure' named Small Henge at the centre. It's about fifty metres into Northumberland and two cairns nearby were excavated in 1935 - one of the items found was a gold trug hair tress. There's a picture of it at the Museum of Antiquities website.

There's a lot of responsibility though because the pictures influence so many people's perception. We'll think that that really was how it was. Seahenge 2 seems very strange and almost modern sculpture.