How exactly would you prove that.
You lose your card and the finder buys £300 worth of items, how do I convince the bank that it wasn’t me. ????
Based on where I work, some thing like this has happened, and the loss of the card was reported to the police. But first of all contact your bank, the minute you realize, you have lost your card, and that card gets cancelled.
Any transactions by contactless not authorized by you, will be covered by the banks insurance, and any fraudulent transactions refunded. Once both parties have been informed, a general request by the police will be done with the shop where the fraud took place, and they check cctv
And most times a few days later, the police turn up at the door of the person, who fraudulently used the bank card