As the cameras burped and clicked, as an aggravated nation watched, Boris Johnson announced that he was giving up. ‘Let us seize this chance and make this our moment to stand tall in the world,’ he said. ‘That is the agenda of the next Prime Minister of this country. Well, I must tell you, my friends, you who have waited faithfully for the punchline of this speech, that, having consulted with colleagues and in view of the circumstances in Parliament, I have concluded that person cannot be me.