Since the election of Zack Polanski as leader in September 2025, support for the Green Party has grown exponentially. An October 2025 poll showed that 25% of voters aged 18-49 felt that they would vote for the Green Party in the next general election, beating Labour (21%) and Reform (19%), and Green Party membership has increased by 80% since Polanski’s election.

More recently, Coventry South MP Zarah Sultana, who founded socialist-focused Your Party alongside Jeremy Corbyn, endorsed Green Party candidate, Hannah Spencer, in the Gorton and Denton by-election.

This is in spite of her prior criticisms of the Green’s ‘pro-capitalist’ policies. Sultana stated that Spencer was the strongest opponent to Labour and Reform in the absence of a Your Party candidate.

Published in October 2025, Polanski’s economic policy focuses heavily on social and environmental issues.

Proposals include £40 billion annual investment into a ‘green economy’, an annual tax of 1% on assets over £10 million, reforms to Capital Gains Tax, and removal of the upper earnings cap on National Insurance. Polanski has stated that his aim is to tackle the ‘deep inequality’ in British society, taxing ‘unearned wealth’ (second homes, stocks and shares) in the same way that income is taxed.

His belief is that these reforms could raise up to £25 billion per year.

Crucially, his proposal focuses on taxing the wealthiest to correct disparity in the UK.

Polanski’s view that we should be prepared to borrow to invest has faced widespread criticism, considering that national debt is currently 95% of GDP. Many have drawn comparison to Modern Monetary Theory (MMT), which theorises that the government must effectively create money themselves, and use taxes to allow government spending and to mitigate inflation.

Proponents of MMT believe that it is the best way to uphold supply and demand for currency and maintain employment, and that national debt is a non-issue.

However, MMT has never been properly tested, and critics argue that it is overly simplistic, overlooking the larger class struggle.

As Grace Blakeley argues, even if everyone accepted MMT overnight, the structure of society, and the way that money is spent, would not change.

As a self-described populist, Polanski’s policy seems overly idealistic to many.

Furthermore, considering the ever-growing number of voters choosing Reform over the Conservative Party, Polanski’s economic policy may not be enough to bring these voters over to the left. Around 50% of voters cite the economy as one of their main concerns when choosing which party to vote for.

Contrasting the ‘green economy’ proposed by the Green Party, as well as Polanski’s focus on ending the genocide in Palestine, Reform’s economic policy states the intention to scrap Net Zero to cut energy bills, and cap foreign aid at £1 billion.

Reform’s policies are overall easier for voters to understand, with clearer actions set out to reach economic targets.

Polanski’s green economy and willingness to borrow money is likely to be more difficult for voters to comprehend, and may sway them away from the Green Party.

Additionally, in 2024, Reform took £4.75 million in donations, largely from a handful of wealthy donors, with £100,000 coming from banker Roger Nagioff.

These are the same people who would be taxed at higher rates under Polanski’s policy, and therefore are more likely to speak out against him, further pushing voters towards Reform.

As mentioned above, Polanski’s economic policy has also faced criticism from Your Party for being pro-capitalism.

This could split the vote between Your Party, Labour, and the Green Party, at a time where Reform seems to be the biggest threat to left wing politics. A split vote could lend itself to a Reform win.

However, the Green Party seems to be offering hope to many left-wing voters, at a time where many are becoming disillusioned with Labour.

As a leader, Polanski has clearly done something right, bringing Labour voters over to the Green party and offering them a real option.

In the 2024 General Election, the Green party had 6.7% of votes, winning 5 seats.

Now, just 38% of those who voted for Labour in 2024 would vote for them again, with 15% choosing the Green party instead, and 17% being unsure on who they would vote for in the future.

Overall, the Green Party under Polanski seems to be a more promising left-wing option than the current Labour government for many voters. Despite this, Polanski’s economic policy is in need of improvement before the next General Election to continue competing with Reform.