I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Rogiet Countryside Park has a free car park, just beyond the Severn Tunnel Junction, so it is also accessible by train.
Up until 1987, Rogiet Countryside Park was a busy railway marshalling yard. The sidings are long gone, but the main line still passes by with a good number of intercity, local and goods trains passing by around the clock.
Open countryside around.
However be aware of the Rogiet Moor Ranges to the south east of the site, on the other side of the M4.
Good views of the Severn estuary and Prince of Wales bridge.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 25/08/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.