The crowd roared with delight as Jeremy Corbyn walked on to the main Pyramid Stage of the Glastonbury festival at the weekend. Tens of thousands of ecstatic followers chanted his name, many wearing T-shirts showing his face and some with “I love Jez” written on their foreheads in glitter. Hailed as the “hero of the hour”, it was not long before the 68-year-old jam maker was suggesting to his host Michael Eavis that he could be prime minister within six months.

“Politics is about the lives of all of us,” he declared, as he waved around the Labour manifesto. “The wonderful campaign I was a part of and led brought people back to politics because they believed there was something on offer for them.” Yet