I'd order online. Plenty of places to choose from,
www.dabs.com.
www.ebuyer.co.uk.
www.overclockers.co.uk to name just a few.
I still believe that any of the Linksys WRT54G series routers will do for you with the GS being at the top of the tree (and price), GL middle of the road, and G the lowest denominator.