Thia '45-'65 map has a trig point, and mast on the current image.
https://maps.nls.uk/geo/explore/side...&right=BingHyb
And for IFT's position this:
https://maps.nls.uk/geo/explore/side...&right=BingSat
Theres a building marked, but no antenna. One corner is marked 'revision point' so clearly part of a survey, an important location