What Hamilton, Bermuda based holding company who formerly featured CEO John J Byrne?
White Mountains Insurance Group White Mountains Insurance Group () ) is a financial services holding company based in Hamilton, Bermuda.
Colin Drummond Colin Irwin John Hamilton Drummond OBE (born 22 February 1951) is a British businessman. He is the chief executive of Viridor and joint CEO of Pennon Group, a British water utility and waste management company.