On the OS map this possible ruin looks similar in size to a tinners’ hut.
A short distance to the east is another similar sized ruin with a possible wall.
Archives
Crane Hill Pool, on OS map
B.M. 1470.8, NWF (Not Located)
Very surprised not to find this one.
Reference: Side by Side
Ex Trig Point, 1544.7 ft, Crane Hill
B.M. 1425.3, EF (Not Located)
There is a massive rock at this location, but I couldn’t see far underneath the turf that has to be concealing this benchmark. (MP comment)