I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
CADW property, but you can take off from the fields across the road. The car park was empty when I visited due to COVID.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 14/09/2020. It remains the responsibility of any pilot to check for any changes before flying at the same location.