Can anyone place this underground post?

An underground post with the counter balance weights on the exterior of the hatch cover.

Thoughts so far...

...I was sure it was the post at 8/K2 Cotgrave, decommissioned in 1968. This proved not to be the case !.

...must be Sherburn Hill, Co. Durhan. But again, on visiting Sherburn Hill a couple of months ago - nothing now remains apart from two ' suspect' grass covered mounds, again, it cannot have been this post either. Why ?, because in the photo, there's clearly a stone wall in the background, and neither of these sites has a wall within miles !.

...Answers on an email!  to Geoff Cameron