I have just added this to the map of places to fly your drone at Drone Scene - Location # 908
Land owner permission not required.
On the opposite side of the entrance, on the side of the road, you can park and take off easily. You can fly around the castle I you can fly without by issues and outside the boundaries of the castle.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 02/01/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.