This is a refurb unit - meaning that someone has brought it back in-store as they no longer require it due to various different reasons. All refurb units go through thorough checks at Apple's HQ and then resold. In most cases, if not all, these Macbooks are in brand new condition and due to laws/regulations - Apple are not allowed to sell these as 'brand new'. Example: you buy a product, you open the packaging and then decide you no longer want it because you've seen the same item elsewhere with a better offering.
Very good price considering its £929 brand new.
1 year warranty included
13.3-inch 1280-by-800 pixel LED-backlit display
160GB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
Built-in iSight camera
3% quidco too...