In his highly entertaining biography of Winston Churchill, Boris Johnson observes that — “To some extent all politicians are gamblers with events. They try to anticipate what will happen, to put themselves on the right side of history.” Mr Johnson even interprets his hero’s decision to campaign against Hitler, early in the 1930s, in this cynical light, explaining that Churchill — “Put his shirt on a horse called anti-Nazism?.?.?.?and his bet came off in spectacular fashion”.

I thought of that passage when I heard that Mr Johnson has thrown in his lot with the Leave campaign — ahead of Britain’s referendum on EU membership on June 23.

Mr Johnson has put his shirt on a horse called Euroscepticism. He is clearly hoping that his bet will also “come off in spectacular fashion” and carry him, like Churchill, all the way into 10 Downing Street — preferably without the added bonus of a world war.