Nicola Sturgeon this week finally delivered the speech that had seemed almost inevitable ever since the Brexit vote in June last year. By announcing her intention to seek a second independence referendum, Sturgeon has started a political storm that will likely rage on - at the very least - until any referendum takes place.

John McDonnell, Shadow Chancellor and veteran of the Labour Left, has warned of a "soft coup" being orchestrated to undermine Corbyn's Labour leadership. Owen Jones, meanwhile, has called on Corbyn to stand down and "do a deal" with the Blairites in order to pass on the baton to a left successor. The only way forward for the Left, however, is to boldly go on the offensive.