Acres of newsprint and hours of media time have been taken in discussing Alistair Darling's revelations on the Jeff Randall show on Monday. The BBC's political editor, for example, suggested that the Chancellor was demob happy. Whatever the results of the General Election he thought Alistair Darling's time at the Treasury was now limited.
I think there is a much more plausible explanation. When the Prime Minister last shuffled his Cabinet he was intent on putting Ed Balls into the Treasury.