I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Spectacular remnants of a dead-end technology, the three concrete “listening ears” at Denge near Dungeness in Kent are the best known of the various early warning acoustic mirrors built along Britain’s coast.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 10/07/2022. It remains the responsibility of any pilot to check for any changes before flying at the same location.