If you order prebuilts from sites like iBuyPower, shipping usually is over $100. If you have the money to afford that, and can't build it yourself, go for it. But if you know what you're doing, and how to put it together, go to
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Great prices, great customer service, free shipping a good 90% of the time.
iBuyPower, CyberPower, and shit are okay, but overpriced and you could get a better PC by building it yourself off of sites like Newegg.
If anyone tries to say Alienware, just ignore them straight off. They obviously over-paid for theirs (and not to mention got shitty quality) if they have one.
Of course, it's not pre-built like you asked, but it'll save you tons of money. Newegg also has a lot of great pre-builts anyways.
EDIT: Just realized you're in the UK. Nevermind. :p