Seen with other geese - not a vagrant to Britain, it will be a feral/escaped bird.
No interactions present.
It is difficult to be certain, but the bird looks to be pinioned (only one set of primaries, so incapable of flight), which would make a certain degree of sense as very few waterfowl collections would be so neglectful as to allow the species to breed and either not realise, or not pinion any young.
If it is pinioned, it has either been deliberately released or inadequately fenced-in in a collection and has escaped.
Lat/Lng: 50.7, -1.5
OS grid ref: SZ4197