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He’ll ‘never be prime minister’, but how will Zack Polanski’s Green Party victory change UK politics?

Green Party members have overwhelmingly chosen “eco-populist” Zack Polanski as their new leader. But it’s a choice which could have big ripples for how Britain is ruled

Zack Polanski may never be prime minister, but his election as Green Party leader could shape how Britain ends up being governed after the next election, experts tell Big Issue, presenting a big challenge for Keir Starmer on Labour’s left flank.

After his landslide victory in the Green Party’s leadership contest on Tuesday, offering a strong left-wing populist vision for the party, Polanski said the Greens were not there to be concerned about Labour, but to “replace” them.

Pro-immigration, trans rights, and anti-NATO, Polanski’s task is complicated by the emergence of Jeremy Corbyn launching a new left-wing party during the Greens’ leadership campaign.

“He will never be the prime minister, but as we’ve seen in the case of Nigel Farage, you don’t need to be to make a difference in British politics today,” said Peter Allen, professor of politics at the University of Bath.

“His election will have worried Labour, which can’t afford to see its vote chipped away at from the left, especially among younger voters who may feel that Labour aren’t doing enough to change the trajectory of key issues ranging from the cost of living to events in Gaza.”

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The Labour assembly member, a former actor, hypnotherapist, and former deputy leader of the Greens, told Big Issue in June that he wanted to make Starmer more scared of him than of Nigel Farage’s Reform.

As leader, however, Polanski cannot set party policy or tell the Greens’ four MPs how to vote in Westminster. Instead, his election gives him a wider platform and media visibility.

He hopes his populist platform can peel off voters who may be tempted to go to Reform. In the wake of protests outside asylum hotels, Labour has taken a harder line on immigration, announcing a wave of crackdowns, including a warning for international students not to overstay their visas.

Will Jennings, professor of political science and public policy at the University of Southampton, said Polanski’s victory showed Labour faces a “significant challenge” on its left flank. “The next election is likely to be characterised by fragmentation of electoral support, and the Greens will pose a challenge to the government on the left just as Reform will pose a challenge on the right,” Jennings told Big Issue.

“These will be in different sorts of constituencies, of course, with the Greens more likely to pick up support in areas that are more ethnically diverse and have more university graduates.”

But the way this looks on an electoral map of the UK is hard to predict, said Paul Webb, professor of politics at the University of Sussex.

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For instance, on the face of it, Reform’s progress at the expense of the Tories should be good news for it – but by further weakening the Conservatives, it might actually serve to help the Lib Dems somewhat, since the Lib Dems’ nearest constituency competitors are often the Tories. So Reform could gain votes without adding many more seats,” he said. 

“On the left, we can expect some disgruntled Labour voters to shift to Greens or the new Corbynista party – but a few will also flow to Lib Dems or Reform. To date, analysis suggests Labour is losing more support to Lib Dems and Greens than to Reform, but it’s complicated,” he added.

The effect of which, said Webb, is that a hung parliament is not out of the question.

And a hung parliament brings the possibility of coalitions, deal-making, and alliances. Yet soon after winning the leadership contest, Polanski called Keir Starmer “despicable in terms of the politics” and ruled out a potential coalition with Labour at the next election.

Nor is the left of British politics as simple as it was when Polanski launched his leadership bid. In his interview with Big Issue, the then-candidate hinted he would like suspended Labour MPs such as Jeremy Corbyn and Zarah Sultana to join the Greens. Since then, however, the pair have launched a party – provisionally called Your Party.

Politics is getting more fragmented, but not in the way many think, added Webb, but the end result is less dominance for the Tories and Labour. “There is growing evidence that such fragmentation is mainly occurring within the right and left-wing blocks of parties. That is, we still basically have a bipolar pattern of party politics, but Labour and the Tories do not dominate their respective ‘poles’ to the extent that they once did.”

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