Does Polanski have to go? Greens at the crossroads after Holborn and St Pancras

Pressure is building on the party leader after byelection defeat, a damaging row over Zionism and polls that show him less popular than Nigel Farage

When Zack Polanski addressed his campaigners flush with victory after the Gorton and Denton byelection in February, he declared: Labour's electoral stranglehold is over." The election of Hannah Spencer as the new Green MP for the Greater Manchester seat was a seismic victory, he continued: I said we were here to replace Labour and this is what replacing looks like."

But in the wake of Polanski's defeat in the Holborn and St Pancras byelection on Thursday, and a calamitous row over the party's stance on Zionism, the debate around what, or who, could be replaced has shifted to Polanski himself.