I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
From the small car park just off the A68 walk down to the viewpoint at the old Drygrange Bridge. From their go through the gate on the old minor road on your left which leads up the hill to the Trimontium Roman site. My TOAL spot was at the edge of the minor road (closed to traffic and is now a public footpath) at the Trimontium information board.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 23/09/2020. It remains the responsibility of any pilot to check for any changes before flying at the same location.