A customer came in with an empty bag of Hills puppy food and asked for a full one. Seeing it was the one kilo size I picked one off the shelf and put it on the counter. “No not that one,” said the customer. “I have a £5 off voucher for the 3 kilo at home.” Not much good at home, I said. “Happy to redeem it but you must have it with you and fill it in. So the customer went away and came back three hours later with the voucher. So if she had a voucher why not bring it in with her in the first place? :?