For a long time now, I've had a bit of a problem with credit (and debit) cards. Not mine, other people's. Before you call the police, I haven't been walking off with them, but I do want to be able to handle them. Because every now and then someone will ring me up, or approach me when I'm selling books, and say 'Do you take cards?' and I have to say 'No, just cash or cheques.' Until recently the UK solutions for simple card acceptance have been decidedly second rate. As most of them don't accept chip and PIN, you can't use them with VISA. But now I've signed up for WorldPay Zinc which does all the main cards (except American Express), and so far I'm very impressed. You can take cards over the phone via their website, and you can take cards on the spot using a little chip and PIN device that links to your smartphone by Bluetooth. There's a fee of £59.99 to buy the reader (but see below for a discount), but apart from that, all you...