1)Simon McDowell (Ireland) – £41.8 M
Retired Irish rugby player, Simon McDowell and family has a net worth of $54 million as of May 2012, according to the Sunday Times Rich List. A keen rugby player until injury forced him to hang up his boots in 1990, McDowell, 43, played for North Ireland Football Club from 1987 until 1990 before turning to refereeing, making his debut in 2002. McDowell was a referee at the 2007 and 2011 World Cups.
He spends 1,000 hours a year keeping fit for his on-field duties and also runs Kilwaughter Chemical Company. It started in 1939 as a quarry and mineral processor. In 1989 the company moved into mixing rendering products for concrete. The Co Antrim-based operation is owned by the McDowell family and made £4.1m profit on £18.1m sales.