If you really aren't going to use them you should pass them on as presents or sell themWhen I left my last job almost a year ago they gave me £60 in Halfords vouchers as a leaving present... I still have them as I've never found anything in there I wanted to buy (always seem to miss the bargains) been waiting on some decent lights to come on offer or something.
To add to the problem I turned 50 and ended up with a £50 voucher to go with it.
So now I have £110 of halfords vouchers I can't seem to spend, 10% BCS on top too.
Almost bought some Gore bib shorts on offer... but didn't like the pad.
I seem to just haunt the local stores in the hoppe of tripping over a bargain.

Seem a shame you're left with them and don't want them.