I'm *not* affiliated with this site, I just found it while I was looking for some pre-built PCs for a friend, and thought I'd give people a head-up as they actually look pretty good.
http://www.cyberpowersystem.co.uk
Most prebuilt gaming systems are either £3000 overpriced, SLI'd monsters or had their components picked by idiots, with things like 'with powerful Intel onboard graphics, you can enjoy the latest 3D games'. The uber-powerful ones are ridiculously priced, but they actually seem to know what they're doing with regards to low-end gaming machines and haven't stuck a pathetic graphics card in just to knock £100 off the price.
http://www.cyberpowersystem.co.uk
Most prebuilt gaming systems are either £3000 overpriced, SLI'd monsters or had their components picked by idiots, with things like 'with powerful Intel onboard graphics, you can enjoy the latest 3D games'. The uber-powerful ones are ridiculously priced, but they actually seem to know what they're doing with regards to low-end gaming machines and haven't stuck a pathetic graphics card in just to knock £100 off the price.