David Cameron was the worst prime minister in British history. But Theresa May risks becoming a rival for this status. Cameron committed a huge unforced error in calling for an unnecessary referendum on the UK’s membership of the EU. May is risking a no-deal break with the EU. This is what I have long feared would happen. If it does, she is to blame. May’s tactics recall one of the stories of ancient Rome. Disguised as an old woman, the Cumaean Sibyl came to Tarquin the Proud, last of the city’s kings. She offered him nine books of prophecies at an exorbitant price. He refused. Thereupon, she burnt three and offered the remaining six, at the same high price. Tarquin refused once again. Promptly, she burnt three more and repeated her offer. A chastened Tarquin finally purchased the last three books, at the original price. May, too, plans to ask parliament the same question for a third time. She is also demanding a steep price: acceptance of a deal everybody resists. When she threaten...

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