I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Parking is not a problem at the Priory. There are a cafe, toilets and museum and library. It is a short but steep walk down to the river. The castle is under state care so no flying within it. Down at the river there are a number of places to fly from. As this is a deep river valley that is well wooded satellite acquisition is a bit slow but 17 plus is possible. There is a lot of industrial heritage along the river to be explored.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 23/08/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.