Keep your enemies closer...

In fact, although the Foreign Secretary’s hair ‘style’ is more reminiscent of a madcap circus performer than anything else, he is a political operator of high skills and cunning.

So there was certainly nothing naive about his actions a week or two ago, when he not only breached the draconian Cabinet rule of collective silence, he also breached the rule that you do not stray out of your own ministerial portfolio, and ‘invade’ someone else’s.

Johnson not only leaked what the Cabinet were planning to do but also assumed the mantle of Health Secretary Jeremy Hunt in saying the financial benefits from a successful Brexit should be poured into the National Health Service.

The Prime Minister was not pleased. She rapped his knuckles sharply with the metaphorical ruler and said that such conduct by any member of the Cabinet should not be repeated.

So what was in Johnson’s mind? He well knew that what he was doing was at odds with strict Cabinet rules. But what many of his colleagues suspect is that he’s angling to get the sack. If he was thrown out of the Cabinet, he could operate far more dangerously as a threat to the leadership – if that is what he has in mind – than if he tamely resigned.

It may well be tempting to the Prime Minister to boot him out, but she must try to avoid that temptation. Johnson shows all the signs of being more ambitious, and you get the feeling he is gagging to lead the Tories into the next General Election.

If Mrs May fails to avoid the temptation of dumping him, the glistening knives could soon be flashing. You have been warned Mrs M!

- Jeremy Corbyn also has internal party problems – although not on the scale of his opponent. According to the outspoken Labour back-bencher John Mann, Corbyn would be in his 70s if he became Prime Minister. That’s far too old, says Mr Mann. But for a man like Corbyn, who digs his allotment vigorously at every possible opportunity, the 70s shouldn’t provide any problem at all.