The Fundamental Bench Mark can be seen in context here
Are we saying that the bench is a trig point?
It's not a trig point. They are all out of use now. Fundamental Bench Marks are still in use in connection with GPS. I don't have any more detail I'm afraid.
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Photo taken in Great Bedwyn, Marlborough, Wiltshire SN8, UK
Misplaced? Suggest new location