http://www.scan.co.uk/products/156-asus ... w-win-7-hpYou're pretty stuck for getting a gaming laptop for under £400 am afraid :/
Seems ya need about £600 ish for a good one

Teh one i linked above is cheap, but ya really need to buy a laptop that you can up-grade the graphics card on, not sure if the one above is able to do that...... but if ya get one that you can upgrade graphics on, at least if you save up for monies, then in 6 months time or so you could buy a new gfx card for it ?