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Had someone suggested 15 years ago that Boris Johnson might become the prime minister of Great Britain, the likely reaction in almost every quarter would have been untrammeled hysteria quickly followed by blithe accusations of wishful thinking. Then, as is the British predilection, someone might well mischievously have added that “actually that could be rather fun” — albeit in the same sort of way that it would be rather fun to have Bertie Wooster or Eric Idle installed as the head of the British government or to have Yogi Berra appointed as the White House press secretary.