I just got a V-Card from my local Varsity bar. As well as giving you 25% off selected drinks etc in the bar they have offers for this year at certain merchants - one being play.com
Once you register your card you can:
Go through quidco to get your 4% cashback at play.com
Put your V-Card number in the voucher slot and you get 5% off straight away! It works.
Other places with discount include figleaves, dominos, fitness first, firebox and others!
Cost of card is £2 but Ive saved that already. Valid for a year so you will get your money's worth thats for sure.