Supermarket giant Tesco is among several leading UK retailers who will pilot a scheme to allow customers to pay for groceries with their fingerprints, instead of their credit cards. The technology has already had great success in the US, where consumers do not have to worry about forgetting their purse at the checkout. To pay, they simply press their fingertip against a sensor and enter a password, a process which calls up pre-registered information on fingerprints and bank account details.