The Green leader wants executives to hold greater control over policy direction after a conference resolution triggered fierce internal revolt.
Senior figures call for constitutional reform after just 1,022 conference votes defined Zionism as racism and backed a single Palestinian state.
Zack Polanski's party claims a close second place after a damaging week of internal arguments over its new Zionism policy.
Polls open in north London to choose Keir Starmer's successor as Green leader Zack Polanski challenges Labour's Sagal Abdi-Wali.
Brighton & Hove City Council's leader accused the party of a dereliction of duty after its members voted on a motion equating Zionism with racism.
The party faces warnings of high-profile resignations as members prepare to debate a highly divisive motion.
The Green leader is pitching an emergency brake on rents while fighting to protect party momentum against a left-leaning Labour government.
The 41-year-old former prime ministerial adviser, whose family has a long political legacy in India, won a seat for the Green Party in Stockholm.
The Green Party leader will stand in the London constituency, setting up a high-stakes test for Andy Burnham's Labour government.
