It is not a ban, when 3/4 of a million people who have applied have been granted and millions more could get a gun if they wanted one.
The common reasons to grant are sports shooting (target, clays) game (grouse, deer) vermin control (rabbits, foxes), population control (deer again) and humane killing.
Licences are also granted for collections (museums displaying firearms will have a nominated licence holder), historic weapons (I did a licence for a WWII luger taken from a surrendered senior Nazi), research and development of weapons (secret stuff that even now I cannot discuss) and for film and TV work (the companies rent weapons off approved weaponry experts).
Shotgun only licences do not legally need to provide a reason, but they are asked and always give one.
A few people, including a distant relative of mine, have guns for self-defence reasons, many of whom are in Northern Ireland.
It does not matter where you live, what matters is that you have permission to shoot over suitable land for one of those reasons, or you qualify for a collection etc.
It is default approval, so long you meet the criteria, which is not that difficult for anyone who is not a criminal or nutter and can provide one of the many reasons to possess.
It is false to describe the UK system as really restrictive and a de facto ban. So long as you are a decent person and you have a reason, you WILL be granted a licence.