Five Questions for Dr Don Brash.............................. Nobody today in so many different roles and for quite so long has stood at the centre of public life so enduringly as Don Brash. Economist, businessman, banker, politician, the former Governor of the Reserve Bank and leader of the National Party has defied typecasting. At one and the same time severe yet extravagant, austere yet colourful, scholarly yet populist, he has contrived always to reconfigure himself around the times. Now he has stridently intervened in institutionally-fuelled separatism. Shrouded in a protective veneer of high-minded fashionable purpose that makes ordinary people fearful to question…