Hello! Few things:
A) Get a drysuit. Don't waste your money on a wetsuit, especially if you will continue to dive in the UK. Drysuit and a good undersuit will be much better (especially if you get cold!), and will keep you happier in the long run.
B) Before you buy a BCD, try a BP/W. If you ever find yourself down in the west country and fancy a dive at Vobster, let me know. I'm happy to lend you my single tank wing set-up for you to have a go.
C) Regs wise: Look at Apeks. A DS-4 first stage and 2x ATX-40 second stages will be all you ever need. Cold water rated, serviceable pretty much anywhere in the UK.
Apeks ATX40 Regulator with Octopus & Double Console
Thanks for the offer! I'm not so sure about the drysuit though, even though I want to dive in the UK I probably will stick to summer time for now. But I might consider it for the future .