I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
The Duddo Stones, are accessed by way of a permissive path, with parking at What3Words: cookie.elastic.playroom
The land owner has put up notices indicating where to park.
Wear boots or wellies, the path can be muddy, even on a dry day, and be careful what you step in…
It's a little over 1km from the car parking place to the stones.
Just to make life really interesting, various websites state that the stones are owned by English Heritage, but the land-owner controls access.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 13/02/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.