*Today Only* For those of you after an internal 2.5", 3 year warranty, cheapest anywhere.
Make sure you become an AVForums member for free delivery (save £7 delivery!)
Use the tesco deal for an externalhttp://www.hotukdeals.com/deals/wd-elements-1tb-portable-2-5-hard-d/763036#comments
Edit: Thanks for the poster below! Beware as the drive is 12.5mm, thicker than the normal laptop hard drive! Still, good for a MBP :)