SPECIAL FEATURE - Until recently, the question of whether banks or other firms should combine the role of chairman and CEO was one on which well-intentioned people would differ. UK corporate governance codes favour a split. US companies tended to combine the roles. Corporate collapses like WorldCom have changed all this. When court-appointed monitor Richard Breeden dissected Bernie Ebbers misrule of the US communications giant he eviscerated the company for the absence of checks and balances on