The Dell outlet currently have some fantastic deals. Until the end of the month they have several hundred pounds off.
Unfortunately, the news is out, and people are refreshing the page every few seconds to spot when the latest bargain appears. But you can get a very decent laptop for under £500 inc VAT if you shop hard enough. People I have spoken to are getting brand new units, although they could in theory send you a recon.
http://www.dell.co.uk/outlet