Andrew Mitchell could have been victim of 'gigantic conspiracy'
Britain's top civil servant believes Andrew Mitchell, the former chief whip unseated by the ``plebgate'' row, could have been the victim of a ``gigantic conspiracy'' involving members of the diplomatic protection group that guards Downing Street.
Andrew Mitchell resigns over allegations he called police ``plebs'' - which he denied in a letter to the prime minister, although he admits using the f-word.