I bought some shopping in Tesco yesterday and used one of their new-fangled checkouts. It’s very clever: you scan the stuff yourself, swipe your bank card and, er, that’s it. However, when I swiped the card it didn’t ask for a PIN – which means that you could use anyone’s card.

Tesco is apparently going to make its self-service checkouts Chip and PIN to address the problem, and it says that a signature is required for transactions beyond a certain level (although I can’t find any figures to say what that “certain level” actually is). But for now, the firm’s offering a fantastic opportunity for card crooks.