I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission obtained.
The dome itself is now a museum, and was used during WW2 for training anti-aircraft gunners. A projector and mirror system was used to play film of enemy planes onto the interior of the dome, and trainees used a dummy gun to try and shoot them down.
Parking onsite and staff were very helpful and accommodating. Museum is also very interesting.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 10/09/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.