I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
See PDF at https://www.hounslow.gov.uk/downloads/file/1636/park_rules_and_byelaws
Allowed times and locations:
Monday-Fri | 1 Sep-30 Apr | 10am-4pm | The Plateau
Every Day | 1 May-31 Sep | 10am-4pm | Anywhere
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 13/11/2020. It remains the responsibility of any pilot to check for any changes before flying at the same location.