Andy Burnham will enter 10 Downing Street on Monday with a wave of enthusiasm behind him and a mountain of challenges ahead.Burnham inherits an economy that was improving until the Iran war upended forecasts and growth is now widely predicted to slow sharply over this year while inflation rises. (REUTERS)His coronation as British prime minister may be short-lived as he faces the same struggles as his predecessor in trying to temper a cost-of-living crisis, improve overstretched public services, and step into the international spotlight during major wars in Ukraine and the Middle East.He arrives after spending most of the past...