On a dawn raid with benefit fraud investigators
It is estimated that £22bn worth of taxpayers' money is lost each year in the UK through fraud and error.
A sizeable part of that is benefit fraud - money that could end up coming out of the pockets of those in genuine need.
Richard Bilton went on an early morning raid with fraud investigators.
Panorama: Britain on the Fiddle is on Thursday, 3 November at 20:00 on BBC One (except Scotland)