It was the moment when Rishi Sunak’s faltering election campaign looked like it was close to breaking. Britain’s clearly wounded prime minister was forced to admit on Friday lunchtime that he had made “a mistake” in not participating in an international commemoration for the 80th anniversary of the Normandy landings – known in the UK as D-day – attended by Joe Biden and other world leaders at the American cemetery off Omaha beach. Instead he had travelled back across the Channel early to record a television interview, which is not due to be broadcast until next Wednesday. “These men made...