Over the past few weeks, many of us have watched with evident schadenfreude as Your Party, Jeremy Corbyn and Zarah Sultana’s embryonic progressive-socialist cum Islamo-populist outfit, fell into disarray. The wheels came off quicker than an expensive bike chained to a lamppost in Hackney. The jokes wrote themselves, part Armando Iannucci (‘Stalin would be loving this!’), part Monty Python (‘We’re the People’s Front of Judea!’). But an Ipsos poll suggested that one in five British adults would consider voting for Your Party, rising to one in three among younger and Labour voters. New parties often do well, of course. But, as the steady rise of the Greens also shows, there