I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
I parked in a lay-by by the start of West Kennet Avenue, and flew to Avebury from there. It is no more than 2 mile round trip. Parking is free.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 13/11/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.