This seems like a good price for a Core 2 Duo laptop.
Aspire 5633 WLMi
Processor: Intel Core 2 Duo T5500 1.66Ghz 667 FSB 2MB L2 Cache
RAM: 2048MB DDR2
Hard Drive: 120GB
Screen: 15.4" TFT CrystalBrite (1200x800)
Optical Drive: DVD±RW Super Multi
Graphics: Integrated Graphics 128MB
Wireless LAN: 802.11b/g
Operating System: Windows Vista Home Premium Edition
5-in-1 Card Reader
The price is £319 + £3.95 delivery but the 10% off voucher brings it down to £291.05.
Also Quidco is worth a possible £8.73
The picture doesn't match the description though, and it's not clear what graphics it has - this model can have either GMA950 or Geforce Go 7300. The closest model I can find is this one in comet ;http://www.comet.co.uk/shopcomet/product/405140/ACER-ASPIRE-5633-102