BRITAIN IRELAND SCOTLAND YOUNG PEOPLE WOMEN Barry O’Callaghan RESULTS 2006 Ranking Worth Industry 36 £184m ( €271m) Computers The 36-year-old former financier has a 33% stake worth £179m in Riverdeep, the Dublin-based supplier of e-learning that he heads. He is likely to have repaid the £31m incurred when he took the company private in a debt restructuring last year. Other assets take him to £184m. RESULTS 2005 Ranking 35 Worth 2005: £174m