You also have Sabotage, south in Milton Keynes and I think Warfighters is around Northampton (I've not been to Sabotage, but heard it's good) Warfighter has a very fun Killhouse for CQC. Check em out dude.
Try before you buy wherever possible. I'd advise to buy a good mask and decent fitting clothing first up. (I personally hate jumpsuits) Once you get something you personally feel good playing in, you'll feel better out on the field straightaway. Take your time choosing a marker. Think about the kinda game style you want, try to hold and shoot as many different markers as you can. If you ask players nicely, I'm sure they'll let you try stuff out on the target range at least. You can get a good feel for how something handles and shoots. Anything you're interested in, find out about price and any mods that have been done to it. It's all pretty common sense, but I didn't do a lot of this when I started out and ended up changing a fair bit of equipment before long. Spent more than I should have been!
Don't forget about the
Battle of Britain. If you're curious about scenario paintball, (big ass games
) the Super6 series of games have a lot of paintball industry stalls where you can get hands on with a lot of gear. You'll have access to a large pool of players who'll be happy to help.
Good luck with it all dude!