I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Marquess of Anglesey's column is the tall column seen on the left as you cross onto Anglesey from the mainland.
There's a car park for visitors that's usually empty which is a 2 minute walk from the column - w3w locating.finds.erupt
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 08/04/2018. It remains the responsibility of any pilot to check for any changes before flying at the same location.