Visited this site in early July 2008.
Sadly it is pretty much inaccessible now. The paths marked on the OS map are fenced over and have vanished and the chamber itself, when we were there at least, was surrounded by fence posts and farm equipment. It took much jumping of fences and hence ripping of coats to get there. A great shame, for in spite of the concrete (only visible inside the chamber when we were there) it's still fairly impressive. A real pity that our ancestors monuments aren't preserved and cared for more and kept easy to visit for those of us who care about these things.
Something is not right. This message is just to keep things from messing up down the road