One of my favourite things about Jeremy Corbyn, beyond the beard (I do like beards) and the way he was photographed in the Times the other day unabashedly wearing sandals with socks (spunky; no quarter given) is his embrace of dissent as a virtue. Which is a virtue born of necessity, obviously, on account of the way that there are only about six people in the Parliamentary Labour Party who don’t disagree with him on everything, and they’re not safe on telly, either.