The pandemic has thrust the Government Chief Scientific Adviser into the middle of the clash between politics and science. He’s faced criticism from MPs, the press, and the public. Edward Stourton finds out about the man behind the pedestal, Sir Patrick Vallance. From fixing caravans on his parents’ site in Cornwall to breakfast with an mentor and a stint in industry with GlaxoSmithKline, who is the man advising our leaders on the pandemic?