This week Zack Polanski’s Green Party launched its local election campaign, with its sights set on Labour’s flagship councils in London. Polling suggests the Greens are threatening Labour in boroughs like Islington, Lambeth, Hackney and Lewisham – long-standing Labour strongholds. Their pitch to Londoners leans heavily on the capital’s brutal housing costs. Private now average about £2,273 a month, while the typical London home costs an eye-watering £554,000.