In the same way a condom can save you from an unplanned lifestyle adjuster, Sheila Walkington's credit-card sleeve is aimed at preventing a spur of the minute decision that will end in regret.

The sleeve, nicknamed the 'credit card condom', fits over your card and reminds you of the goals you set to curb your spontaneous spending. An ingenious "Why-didn't-I-think-of-this-earlier?" product Walkington's device helps those who find it hard to keep the card in their pockets.

I'm looking forward to seeing what some major manufacturer will do with these.