Brown has moved to occupy ground left free by Cameron's efforts to prove that the Tories have changed. He's done it in a way that maximises destabilising pressure from Tory MPs and what we used to call the Tory press to, you've guessed it, "lurch to the right". And he's made each of his announcements on the one day of the week when the Tory leader used to be able to count on setting the agenda - PMQs day.

The left meanwhile have been given very little to celebrate save for a man they trust replacing a man they'd come to loathe.

Clever isn't it?