I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Drinking water (and flood defence) reservoir with a sailing club on it.
Very clear visibility for other aircraft, good VLOS, very unlikely to overfly or have too close proximity and great visibility to avoid this. TOAL from Molesey Heath Nature Reserve. The byelaws next to the entrance on approach road have no mention of banning aircraft.
Easy parking on approach road or other streets. TFL bus stop at the War Memorial, approximately 15 minutes away.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 27/08/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.