Labour's future leadership hopefuls are positioning themselves in the meantime. Dan Jarvis – a man many moderates dream of as their next leader – is making an interesting speech at Demos this morning. Could the former soldier be the man to give Labour - as John McTernan ponders in today's paper - "a project and purpose"? A change at the top requires a vacancy, and Mr Corbyn remains safe in his job until his MPs and members decide otherwise. But with the party already in the electoral doldrums, and showing no sign of getting out of it soon, how long will that take?