I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Summer Lake, Cotswolds Water Park
The Cotswold Water Park is the United Kingdom's largest marl lake system, straddling the Wiltshire–Gloucestershire border, northwest of Cricklade and south of Cirencester. There are 180 lakes, spread over 42 square miles.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 08/09/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.