Dell Vostro 1000 laptop, basic spec is as title and is a rather eye-opening 329 delivered.
If the spec is too basic, even if you upgrade the battery to a 9-cell, screen to a glossy one, CPU to a Turion TK55, hard disk to 80Gb, and put in a DVDburner, it's still only about the £350+VAT mark. I think that's rather cheap too, although possibly less excitingly so than some of the other circa-£400 deals floating around this site.
There's 5% Quidco on Dell Direct too.
Note from sciliconbits: shipping is quite steep, at £60.