And I only wish I meant 20lbs and not £20. I went to a well known supermarket last night, bought a few items and asked for cash back, rushed out of the shop to son waiting in the cold in the car and drove home. Before I'd even got my coat off, I was asked to go out to buy something which we hadn't got. In the local shop, I got my purse out to pay and I had no money. I called the supermarket when I got home and they assured me that once the till had been checked in the morning and the discrepancy found, as it usually is in these cases, I'd be able to get my money back. They called just a few minutes ago to say, "the till balanced perfectly and there is no money in there that there shouldn't be". I did point out that the money had to be somewhere, because it certainly wasn't with me. She said she'd get the cash manager to check again tomorrow and will call if there's any different news, but I won't be waiting for a call, I shall call in myself. How can I go about proving I didn't get the money and that if their tills still have the correct amount, another mistake hasn't been made at some other point during the day?