The posh one near Hampton wick, other side of Kingston bridge. Website is sigmasport. Another thought, you can buy online from Evans who have a huge selection, you can return in store. I think there's one somewhere in Guildford
Ah ok, I think that's the one with the car park behind it.
I've been to the Evans in Guilford. I didn't have a look around much of the clothing at the time so maybe I should go back there.