Cannock chase Trig point race has one that is seldom seen but visited often if that makes any kind of sense. Its not even on the OS map but there is a bench mark on a concrete block sunk into the ground which is not easy to find for the uninitiated.
http://www.trigpointinguk.com/trigs/...ils.php?t=2038
http://www.streetmap.co.uk/newmap.sr...+-+Castle+Ring