that would be awesome however i'm new to the whole proxy shipping thing xD i'm assuming you are tricking the postage service to think you are in another country so that the shipping is less, right?
It's generally to help someone get an item that isn't available in their country (ie, the seller will not ship there), but sometimes it can shave off the shipping expense, especially if there are additional fees through some outlets for int. shipping.
It seems that they offer worldwide shipping though, so you should check out the rate and see how that is, because it probably won't be any cheaper if I'd ship it to you.
As long as it's not eBay's global shipping service, you should be okay, since it comes with a ton of fees. If the seller is willing to sort the international shipping himself, which isn't hard, then it's much cheaper. I don't know how the customs fees work in the UK though.