Illustration by André Carrilho When that great historian Edward Gibbon presented the Duke of Gloucester with the second volume of his Decline and Fall of the Roman Empire, King George III’s brother reportedly replied to the author: “Another damned thick, square book! Always scribble, scribble, scribble! Eh, Mr Gibbon?” Tim Shipman is a highly traditional political journalist. That is meant as a compliment: he asks people at or near power questions and writes down the answers and reports them. What the Roman empire was for Gibbon, Brexit is for the man universally known as Shippers. The first of his Westminster...