Almost every working adult has a credit card at least. Most have several. Are you planning on signing up for another one? Why not sign up for a Mint credit card if you are in the UK? Mint credit cards come in two versions, a standard credit card and the MC2 card which has the bottom right-hand corner removed.
From now until December 2007 Mint is offering 0% on balance transfers as well as 0%interest on purchases and there is no annual fee plus free online account management and many other benefits.
If it's not a credit card you are looking for, how about a Mint Gift Card? Valentine's Day is just around the corner, why not give a gift of a Mint Gift Card to allow your Valentine to pick out something for herself?