Do You Want to Be a Millionaire? It's the biggest heist in British history: a get-rich-quick scam that's easy to run and hard to detect but very lucrative. Fraudsters exploit loopholes in the European Single Market to steal two billion pounds a year from the taxpayer. Justin Rowlatt confronts one of them, a plumber who siphoned away F38 million in just six months. Producer Andrew Bell ; Editor Mike Robinson Signed repeat on Friday at 1.25am www.bbc.co.uk/panorama NOTE: as Panorama reacts to news, its subject matter may change