Boris Johnson, Michael Gove, David Cameron, George Osborne, Theresa May, Dominic Cummings, Daniel Hannan, Jacob Rees-Mogg: Whitehall is swarming with old Oxonians. They debated each other in tutorials, ran against each other in student elections, and attended the same balls and black-tie dinners. They aren’t just colleagues – they are peers, rivals, friends….

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