It's estimated that twenty-two billion pounds of taxpayers' money is effectively stolen or lost every year through fraud and error - a sizeable chunk of that is benefit fraud - money that could end up being taken out of the pockets of those in genuine need. In this Panorama Special, Richard Bilton uses undercover cameras to expose people on benefits sailing yachts and driving Bentleys. And he follows fraud investigators as they tackle the rising tide of benefits cheats using fake identities to steal millions.