Most Canucks (and Limeys, as well) use Newegg to find what they want, and then search for it on their local sites. It is Newegg's search function that makes it so good. The prices can be beat on occasion, but not their search.
Newegg had some plans to ship to Canada and the UK a couple of years back but it all fell through at some point. It's a shame, they'd stand to get a **** ton of business. Not sure why it all never came to be. My guess is taxes and import fees and the like.
dealing with customs and such and since their main warehouse is out in cali. while they do have places in new jersey and tennesse and other places i believe, but it would be a little expensive to ship from cali to england.