HP are running a £150 cashback scheme if you buy certain laptops from their range and trade in an old machine.
The Probook 4525S appears to qualify, and the best (delivered) price I've seen it for online is from Oyyy. If you factor in 3% quidco the price comes down to £240.
Not the best spec in the world, but for basic/business needs it seemed OK to me...
HP ProBook 4525s (WK505EA-ABU) Features
HP ProBook 4525s Notebook PC
15.6 inch LED-backlit HD anti-glare Display
AMD Turion II Dual Core (P520) 2.3GHz Processor
2GB 1333MHz DDR3 SDRAM
250GB (7200rpm) SATA II Hard Drive
DVD±RW SuperMulti DL Optical Drive with LightScribe
Realtek Ethernet Integrated Controller
Broadcom 802.11b/g/n WLAN
Microsoft Windows 7 Pro (32-bit)