I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
London Borough of Hounslow does not have any laws preventing flight of electrically powered aircraft. This part of the park is large and quiet, and has the large GSK building which is interesting.
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.