I also collect small change in a jar and periodically I count it up and take it to the village shop where they are more than pleased to take any amount of small coins from me - even a straight exchange for cash, I don't need to buy anything.
Doesn't your chip shop need change for its transactions?
Dermot: Some of the best fish and chips are from establishments on the sea front in Brighton. If you are down that way, give it a try. Real local fish and real chips - you can actually see the potatoes being cut up at the back of the shops.