I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Lovely park area with a very scenic Viaduct with dual rails going across. There is a large field on the side I took the photo from. There is no access to this field nearby. I took off on the car park near by the arches of the bridge. Please note this is within a FRZ of Cardiff Airport. Applied at https://nsf.nats.aero pretty easily and had confirmation the following day. Once on-site you call Cardiff ATC for permission to take off. They’ll ask you to confirm how long you plan on flying for, you’ll agree to terms over the phone and they give any required warnings. You call them once you are finished. This was my first time applying to fly in a FRZ and it was very simple.
The originator declared that this location was inside a flight restriction zone at the time of being flown. Permission to fly was obtained from NATS/Cardiff Airport. It remains the responsibility of any pilot to check for any changes before flying at the same location.