S30, The biggest hassle you're going to experience is that you're very unlikely to get an FAC earlier than 6 months from Club probationary membership date. You can't really shoot/own anything (except SG) unless you belong to a club.
In order to get an FAC you need to become a full member of a club/s...which takes 6 months on average. The you are allowed to apply for a FAC which takes 3 weeks - 6 months...depending on where you live.
To own Sectoion 1 shotty, you'\ll need to belong to a club like the UK NRA, or Cheshunt which does Practical shotgun, this is the only way the plod will accept you have reason to own a large capacity, semi-auto shotgun (or slug gun). (Unless you need it to take out pests etc...)
PS: Forget about Section 5. You can however, once you're a full member and you pay the extra fees get yourself a 7.3 gun like a Colt .45 automatic or so (Must be dated pre- 1916 or something like that). This you can ONLY shoot at clubs/ranges with 7.3 HO approval. And then only on certain predetermined dates. (They lock the place down and lock the shooters in for the duration of the session) Pathetic really, but there you go.
You'll find that shooting in the UK is very alive and well, but the .gov makes it very hard and arduous to get into shooting proper. Anyone here want to disagree with that statement, bring it on.
I'm waiting for my chance to apply for a FAC in a few weeks.