Zack Polanski has called for a three-year limit on rent increases in a speech to the Green party conference, as he campaigns to win Holborn and St Pancras from Labour. The Green party of England and Wales leader is contesting next week’s byelection in the seat previously held by Keir Starmer.

Polanski said his leadership authority was not contingent on victory, responding to suggestions that support for the party had reached its high point. He assessed the race as roughly even. The party is staging its biggest conference to date following membership gains and electoral victories, including in Gorton and Denton. More details are expected as the story develops.