Television presenter Graham Norton owned 50pc of the So Television production firm, which was sold to ITV for 22m in 2012. The Corkman had earned 12.2m in fees and dividends from the company. Norton reportedly signed a new three-year contract with the BBC in January worth £2.5m a year. He also found success last year with his debut novel, Holding. As well as property investments, Norton produces his own wine, a Sauvignon Blanc from the Invivio winery in New Zealand.