OK, well ... from your examples - the guns held at clubs (can you take them home?), the shooting at birds and game on private farmland, and the target shooting are all things that I covered above saying that afaik you can sill get a license for that, although I expect even that is much more difficult now than it was before things like Hungerfod and Dunblane ...
... as for your Lee Enfield (is that an ancient army rifle?) which you used at "vintage military competitions", that too was presumably target shooting or military re-enacments and such-like. Although even there, I'd be surprised if you are now in 2018 still able to get a license to keep a rifle like that and bullets in your own home, such that you could if you wished just walk out into the street and start killing people ... because that is the exactly the sort of thing that the laws were changed to stop after Hungerford and Dunblane ...
... but afaik the picture I presented of the lack of firearms in almost any normal UK home is true - you certainly will almost never find anyone with legally owned guns in their house (except for farmers, and maybe people who have a licences to shoot game). And you certainly cannot get a license now by saying you need it for such things as self protection or by saying you "need" it to enjoy shooting animals and tin cans in your garden or in the local park.