I have just added this to the map of places to fly your drone at Drone Scene:
https://www.youtube.com/watch?v=JjrGMNZKJKM
Land owner permission requirements unknown.
A very spectacular area to fly. Looks like a different planet, very Mars like. An old Copper mine on Anglesey, North Wales. Very easy to park, loads of parking spaces and free to roam around.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 26/08/2020. It remains the responsibility of any pilot to check for any changes before flying at the same location.