Has anyone else noticed David Cameron doing that thing with his thumbs that Tony Blair does? A masterpiece of editing on the part of the BBC tonight saw him do it twice in the same report: once whilst speaking to a left-wing think-tank (1) and once in an interview (2), both whilst claiming not to be Tony Blair.

But just look for a moment at picture no. 3. That’s why Cameron can never succeed – the Blair Bithumbic Manoeuvre, pioneered by the master himself, and a technique that really separates out the boys from the men. Until Cameron can master it, he’s a spent force before he’s even begun.