I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
From their web site "Llanthony Secunda Priory remains of a once large and important Augustinian Priory which was founded outside the city walls in 1136. A scheduled monument with listed buildings that have played an important part in Gloucester’s history for over 900 years."
It was a nice open area with no big trees in the close proximity!
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 08/07/2024. It remains the responsibility of any pilot to check for any changes before flying at the same location.