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The date of 31 October is significant because if Boris Johnson becomes prime minister, and he can't get his hugely ambitious deal signed off by the EU, then in four months' time he says we will be leaving come what may, do or die, without any agreement.

Boris Johnson has pretty much locked the door and thrown away the key on that. It is au revoir, auf wiedersehen, that's it, we are out.

Why is he doing this?

I think, in part, to send a shiver down the spine of EU negotiators that he is not messing and that he means it.

In part too, it is to allay the fears of some of his Brexit-backing supporters who thought he was just a little bit wobbly and left himself a tiny bit of wiggle room - no more, that's gone.

And in part, he takes a view that Jeremy Hunt is vulnerable on this issue because he has left open the option of delay - although only a delay to sign off a deal, so perhaps a few days or weeks.

But, above all, I think it is because Team Johnson calculates that people are bored to the back teeth of Brexit, they have had enough, they want it done and they want it over.

And what it tells us is after days of dismal headlines about late night rows, staged photographs, the manufacture of cardboard red buses in Chez Johnson, they want a different story, and we are beginning to see emerge a much more hard-edged and focused Boris Johnson campaign.