Chip and PIN has been introduced to deal with card fraud and is already proving successful with lost and stolen, and counterfeit card fraud, down by almost a third in the first half of 2005. Most London retail outlets now offer Chip and PIN for credit and debit card payments. This means you no longer have to sign a paper receipt, but simply enter a four-digit Personal Identification Number (PIN), just as you would at an ATM machine. Check out these tips for remembering your PIN.
Payment Card Schemes:

