Zack Polanski, the new leader of the Green Party, has been studying one politician closely this summer – Nigel Farage.

The 42-year-old, who stormed his party’s leadership contest by a large margin, calls himself an “eco-populist” (he used to be involved in Extinction Rebellion), and thinks the Greens could learn a lot from the media-savvy tactics of Reform which have seen them surge ahead of Labour in the polls.

Politics latest: Chancellor faces ‘toxic combination’ as UK borrowing costs soar

Can the former actor and hypnotherapist, who rails against corporations and wants to tax the rich, take his party into the big leagues?

Speaking to him after his win was announced, Mr Polanski told me: “I despise Nigel Farage’s politics and I’d never copy what he does, but it’s undeniable that he cuts through; everyone knows who he is and that bold messaging – but for the truth, not the lies and misinformation he spins – that’s what you’ll hear more of from the Green Party.”

Mr Polanski is not an MP – he’s been on the London Assembly since 2021 and served as the party’s deputy leader. His two rivals in the leadership contest Adrian Ramsay, one of the party’s current leaders, and Ellie Chowns, were elected last year, but are not well-known to the public.

His more aggressive style and punchy social media clips appealed to party members impatient for results. His videos target “corporations who are destroying our democracy”; warn that “fascism is at our doorstep” and “call bullshit” – as he puts it – on the debate about asylum.

As one of the members at the event summed it up: “People don’t know what we stand for, we need to be loud and clear about what we’re for and what we’re against, and Zac will do that.”

He’s put some noses out of joint within the party, and the tabloid press has called him the “boob whisperer” after The Sun reported in 2013 that, while working as a hypnotherapist, he told a woman who wanted bigger breasts that she could do so with the power of her mind. Mr Polanski apologised and says he is focused on the future.

His ambitions are high for the fifth party in British politics – currently polling at around 10%.

“Thirty to forty MPs at the next election”, he says. Enough to deny Labour a majority if it’s close, or to be kingmakers. As politics fractures, he hopes they could have a big impact for the first time in decades.

The Green Party in the UK – unlike its counterparts in other European countries – has struggled electorally until very recently. It was formed in a pub in Coventry in 1972 by activists inspired by the US environmentalist Paul Ehrlich, who warned that the world was overpopulated, spelling disaster for nature.

Its biggest success was in the 1989 European elections, gaining 15% of the vote, but representation in parliament was not achieved until 2010 when Caroline Lucas took Brighton Pavilion from Labour. She became an influential campaigner on the climate, fracking and animal rights, also warning against economic growth at any cost.

After she stood down, the party struggled to find its voice, with Jeremy Corbyn’s Labour Party pursuing a radical left-wing agenda. Now, after winning four MPs last year, Mr Polanski believes that with Labour in government and Reform at its coat tails, their moment has come.

Read more:
Inside Jeremy Corbyn’s new party and the battle for leadership
Hundreds of empty flats sum up UK’s housing crisis

He told members: “We can, and we will lower your bills. We will nationalise the water companies. We will hold this Labour government to account.

“Because when we look at Keir Starmer and what this government have been doing; whether it’s the two-child benefit cap, the disability cuts, the genocide in Gaza, my message to Labour is very clear: we are not here to be disappointed by you. We are not here to be concerned by you. We’re here to replace you.”

Mr Polanski is unashamedly pro-migration and trans rights. He’s also suggested Britain should leave NATO. He’d consider working with the incipient party being set up by Mr Corbyn and former Labour MP Zarah Sultana, with the support of some of the pro-Gaza independents.

All of that may not endear him to all the Green Party’s potential supporters. The party now has 860 councillors, but some are in rural areas where they’ve won seats from the Tories.

There is a political opportunity on the left. Mr Polanski says he knows what will get his party into the spotlight. But it’s a far bigger task to deliver seats in parliament – including one he’ll need for himself.