 When he was born, they "lived in a couple of rooms in Camden", before moving to the Rockingham Estate in London's Elephant and Castle, where he grew up, and left school at 15 with no qualifications.Mullins was apprenticed to a local plumber at age 15, and started his own business in 1979, operating from a basement in Pimlico.He is known for his collection of plumbing-themed licence plates, used on the company's vehicles, and perhaps worth £1.5 million.