If you end up with a jar of loose change, find a Coinstar machine (usually in supermarkets like Asa and Sansburys) and swap them for vouchers to use in the shop. The company will deduct a percentage as a fee, but I've found it worthwhile. My bank won't let me pay in large numbers of small denomination coins even for charity campaigns (when I tried to pay in £5 of small change for Comic Relief they said processing it would slow their service down, even though the branch was nearly empty) and the bus fare to my nearest branch would take a chunk out of the money anyway. Can't do much else with them other than put them in charity collection cans, and carrying bags of loose change around for those, isn't practical.