Plastic waste pipes and fittings and other people's dirty water have been the source of Polypipe and Kevin McDonald's fortune.
If there's one person who illustrates the cliche, "Where there's muck there's brass", it is Kevin McDonald. One of seven children, the son of an insurance agent, he was born in South Yorkshire in 1933. Today his fortune is worth over £40 million and most of it has been made from other people's dirty water. Polypipe, the Doncaster-based company - he is its chairman and managing director and, with 23%, its major shareholder - is one of the country's leading suppliers of plastic waste pipes and fittings.