In the interests of impartiality, (I know, I know, Ladbrokes have stopped taking bets on my succession to Ban Ki-Moon), I have tried to look dispassionately at the Shadow Chancellor's pledge to raise the top tax rate to 50p if/when Labour retrieve the keys to No's 10 and 11 Downing Street. This notably coincided with the announcement last week of a record drop in unemployment. Firstly, like the...