Can the Greens really go mainstream?

Zack Polanski's party is on the up. But the disruptor left-wing party has a mountain to climb to break through the two-party system.

Insiders say the “Polanski effect” is real. Pic: The Calderdale Lead

For decades, the Green Party has occupied a curious space in British politics.

Highly visible, broadly liked, yet rarely treated as a serious contender for power, the party has long been cast as a voice of conscience on climate and inequality, rather than a party seriously capable of gov…