I saw this on HUKD earlier. After umming and arring over what to get to maxximise the £50 saving it occurred to me that I'd simply be spending money for the sake of it and decided not to get anything.
... and a few mins later it dawned on me that I've been looking for a new VDSL router and was going to buy one in the next couple of days. So I just went for a Netgear D7000 and saved £33 on a purchase I would have made at full price anyway.