The location was Prenton Park in Birkenhead, home to Tranmere Rovers football club. The occasion was the Wirral Live Music Festival, and the Libertines were due to play before a crowd of 20,000. It was the evening of 20 May, and the Labour leader had dropped in to make a brief speech on sport and music. Now he was topping the bill. British politics had never seen anything like it. As he finished, Corbyn shouted, ‘Thank you for giving me a few minutes. And remember, this election is … about … you!’ That was when the crowd found its voice.
