Visiting in a couple of weeks time, and I've been told that you can now just tap your debit card to the reader on the turnstile to pay for the tube. If there's 4 of us going, does everybody need their own debit card? The kids don't have one but I can't imagine that people will be very impressed if we're stood with one card passing it backwards and forwards!
Please explain to a bumpkin how it works!