Bohoola, Co Mayo's Bill Durkan (77) owns over half of Durkan Group, a major house builder and construction company in the UK and Ireland.
Danny Durkan holds the remaining 47.5pc. Durkan won a €32m case against the State over a social housing land swap in 2012. It is becoming more active in Ireland and is building 200 homes in south Dublin. The family are massive racing fans, sponsoring the John Durkan chase at Punchestown, one of Ireland's most valuable races.