Welcome!
Diving in the UK is great, you'd be best off finding a local club to dive with if you aren't already in one. Your nearest BSAC branch should be able to take you on some UK diving, although now is not necessarily the best time of year to start that!
Enjoy
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Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer and RTFM!
Beware Fridge Suck!
www.hugsac.org.uk