What t-shirt shops ship to the UK?

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I'm a big slacker and I like to give off a casual look by wearing t shirts pretty much everywhere I go (with the exception of to nice restaurants... sometimes). Anyway, I just found out I'm moving to the UK so all of my favorite stores here in southern California are really no longer a viable option for me. So, I'm gonna stock up on tshirts before I go, but once I get to the UK where will I be able to order from? I found one place ( http://www.8ball.co.uk ) but I'm not sure if it's good or not. Has anyone ordered from there before? Also, are there any places in the UK that let you create your own tshirts and print them and mail them to you? Maybe I should just start my own t shirt company. That'd be like a dream for me :D Thanks!