I remember when contactless was coming in there was an odd panic that people had when people thought it was too easy. There was (and still is) a worry that someone who finds your card will then use it to go and buy £20 of stuff. But the banks seem happy with the risk. I think you can turn the contactless off at the banks end if you are worried but then you are onto chip and pin. This seems at a whole new level and I wonder what the safe gards are. Like can your doppelganger go and rack up a bill. How do you confirm and dispute payments. What if your just standing in the que behind the person at the till will it pick you up.