I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
I parked in front of the George Hotel, just by the Millpond Bridge. From there you can walk around the castle and millpond partially surrounding it. TOAL was from the South West side of the Millpond.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 28/11/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.