I've now started filling up the car by the litre instead of a multiple of £5/£10. So that the random amount that comes up on my wife's joint account notification hides the purchase of a can of coke and chocolate bar.
@fesshole My wife watches the joint account so I get it. She's not trying to catch me out but she does the money. It makes gift giving hard, though.
A few years back, I bought her a relatively expensive smart watch. Took me months to save up enough pound coins. The guy in Currys called his friend over to help count them all. 😆