in terms of wgp specific servicing you are a bit on your own when it comes to the UK, however there are a few places that could repair or service such as LIPS or just paintball
there are also a few really good autococker techs on here that would be happy to help if you have a problem, so if you post your problem up in the tech troubles i'm sure they will be quick to respond
hope this helps
Ryan, team domination