La Fraise has some original designs including this nerdy iPod shirt:

Bob Donut & Bird - funny t-shirts like
"calm down dear it's only a t-shirt"

A very "Urban Outfitters" vintage style of t-shirt. I particularly like

I've got a black belt... in keeping it real
Only problem, shipping to the UK is $15!
Spunky.co.uk an online store with an outlet near Carnaby St. I like "yesno":
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