A visa that will let you live and work in Britain indefinitely is worth a lot of money to a lot of people around the world - and, as a result, the sham marriage industry is booming. Exposure sent an undercover reporter to find out more about the thriving industry. From alleged fixers offering a young women as a fake bride for £10,000, to talk of fake passports and a clandestine meeting with an underground "Mr Big", we see a system failing to keep up.