//The maplin near me is next door to a PC world, Last year I needed a new external drive *same day* I saved £20 by walking next door (And PC world still ripped me off compared to the price online!)//
Funnily enough I did that this year, but with the stores reversed. Maplin was cheaper than PC world - not by £20, but by a bit.
No, I didn't take the extra insurance they offered.