Online retailer Dabs is selling the Acer Travelmate P253-E laptop for a mere £279; it comes with some great components including the Intel Celeron 1000M.
This processor comes with two cores clocked at 1.8GHz and 2MB cache. The name Celeron has often been associated with low performance but this particular model is based on the Ivy Bridge architecture which means that it should perform very well.
The rest of the features includes a 15.6in 1,366 x 768 pixel display (we'd probably prefer a much smaller display), 8GB DDR3 system memory, a gargantuan 750GB hard disk drive, an optical drive, an integrated Intel HD graphics chip, a fast Ethernet port, Wi-Fi, a card reader, USB 2.0 ports, HDMI, VGA, a webcam and a multi gesture touchpad as well as a dedicated numeric keypad.
Note that this is a brand new laptop and if you don't mind getting a refurbished model, there are other alternatives available on the market, some of which we recently covered like the Dell Inspiron 5040, the HP Pavilion G6 or the Fujitsu Lifebook AH512