I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Large free carpark open 24 hours just across the road from the castle.
Free access to the castle 24/7.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 14/01/2024. It remains the responsibility of any pilot to check for any changes before flying at the same location.