I have just added this to the map of places to fly your drone at Drone Scene:
Mountain to the NW of Cardiff, visible from pretty much everywhere in the city. Open moorland between the villages of Pentyrch & Taff's Well, the location for the romcom 'The Englishman Who Went Up A Hill And Came Down A Mountain', which is a local legend but I have no idea if there is any truth to it! Superb viewpoint, bit hazy when I went up on Monday evening (when there was a gorse fire as well which didn't help)
Easy walk up from Mountain Road, parking for half a dozen vehicles at the start of a farm track, or at various locations further east along that road. No restrictions.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 31/03/2025. It remains the responsibility of any pilot to check for any changes before flying at the same location. Landowner permission may be required before taking off.