I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Parking is as for The Gloup, at the Mull Head car park. The Brough of Deerness is further along the trail from The Gloup, and normally there is access to the headland, but in recent months (April 2023) the path has been closed owing to a land slip.
The site has the remains of an 11C church and other buildings, some dating back to 600 BC.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 26/04/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.