How to get under the Bottler's skin

Interesting moment in the Bottler's press conference.

On the whole, he seemed almost relaxed, stern when needed, even able once or twice to force a joke. Yet toward the end, asked yet again if he had full confidence in Harriet Harman, he suddenly twitched. He started stuttering and frowning, whanged the desk once or twice, before forcing out that 'of course' he had full confidence in Harman.

I hope Cameron took note. There is no question the Bottler is at his most vulnerable in public when he becomes angry. It may work with his toadies. It sure as hell doesn't when he is on public view.