Magic: the Gathering in the UK
I'm not sure if you've heard of this, but I found this site which is useful for tracking and buying cards. The websites there are American, but some are quite cheap (although some do not seem to deliver here). Do check it out. I've purchased some cards from a site called AdventuresON and it only costs $2 to ship it to the UK.
Without further ado, the site is www.FindMagicCards.com. Hope it helps you guys in getting more bang for your buck.
$2 to ship to the UK but unless its below £18 you'll pay VAT on top of that along with a £8 processing fee.