Ebuyer - Cheap Computers, Laptops, Digital Cameras, TVs & more! is a fairly good bet. Lenovo make good fairly cheap laptops (used to be IBM)
Laptops norm start around the £300 mark. Toshiba Satellite L30-11D Celeron M 440 1.86GHz 512MB 60GB 15.4" Widescreen XGA DVD-SM 11BG Vista Home Basic might be of interest.
I wouldn't touch Dell or PC world unless they have a really good deal on, and would get some advise from the forum before buying.
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