I belong to a 3D on-line community called There. It is a great place and I have a lot of friends there. However...It is only open at certain hours of the day, and seeing as the servers are in America, these opening hours are not good for me in the U.K. But I work shifts, so staying awake until 3am isn't a particular hardship for me. Also since coming out of Beta testing there is a feeling that the developers don't care as much for customer support as they used to.
Other than that I'd recommend you signing up and looking out for "Reynolds", I can do you a good deal on a UK T-shirt.