Search the definitive guide to the richest 1,000 in Britain and Ireland

Ray O’Rourke and family

Laing O’Rourke, the company masterminding construction for the 2012 Olympics in London, is run by O’Rourke, 60, from Co Mayo. Profits leapt to £34.4m in the year to March 2006, conservatively raising the value of the British Virgin Islands-based parent to £343m. We assume the family owns it and add £27m for other assets.