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Zack Polanski — portrait

Zack Polanski

Leader

Green politics

The Green Party of England and Wales

Polling average

12.0%

The fastest-growing party in British politics by membership. Zack Polanski won the leadership in September 2025 on an eco-populist platform, and in February 2026 the Greens took Gorton and Denton — their first Westminster by-election win ever, in a seat where the party had never previously passed 10%.

Leader
Zack Polanski
MPs
5 — four elected in 2024 plus the Gorton and Denton by-election gain
Founded
1990
Members
Over 200,000

Where they sit

Position on the spectrum

Left to eco-socialist. Moved sharply left under Zack Polanski, who campaigns explicitly as an "eco-populist" against both Labour and Reform.

LeftCentreRight
Labour-3Reform+8Conservative+5Green-7Lib Dems-2Restore+9

Spectrum positions are editorial judgements, not measurements. How we place parties.

Leadership

The leader

Zack Polanski — portrait

Zack Polanski

Leader

Elected leader on 2 September 2025. A former member of the London Assembly and previously deputy leader of the party, he campaigns as an "eco-populist" and has become one of the most prominent left-wing communicators in British politics.

Track record

Membership and poll share have both risen sharply since he took over, and the party won its first ever Westminster by-election under his leadership.

Rachel Millward — portrait

Second in command

Rachel Millward

Deputy Leader

Co-deputy leader alongside Mothin Ali.

Where they stand

The policies

8 of 10 areas with a position we could source

All six parties are asked the same questions in the same order, so their answers can be read against each other. Positions are the party’s own; anything in the grey line beneath is our note on where a policy is contested or short on detail.

  1. 01

    Immigration & asylum

    Who gets to come here, who gets to stay, and what happens to people who arrive without permission.

    Opposes deterrence-based policy outright, favouring expanded safe and legal routes and an end to hotel-based asylum accommodation.

  2. 02

    Tax & the economy

    Who pays what, and what the state can afford as a result.

    A wealth tax of 1% a year on individual assets above £10m and 2% above £1bn, which the party says would raise £15bn a year. Alongside it, a £15 minimum wage and a four-day working week.

    Economists dispute wealth-tax yields of this size, pointing to valuation difficulty and behavioural response; the party treats the figure as its own costing.

  3. 03

    NHS & social care

    How healthcare and care for older and disabled people are funded and delivered.

    Increased health spending forms part of the capital programme, with the party opposing private provision within the NHS.

    Less detailed than its economic and environmental platform.

  4. 04

    Housing

    Whether enough homes get built, who builds them, and who can afford one.

    Social housing is funded from the same £90bn capital programme, alongside health and education — the party's answer to supply being public building rather than planning liberalisation.

  5. 05

    Crime & justice

    Policing, sentencing and prisons — how much punishment, and how much prevention.

    A presumption against custodial sentences under two years, with investment redirected to courts, diversion schemes and violence-reduction units rather than prison places. The party would restore youth services and community policing, repeal the Police, Crime, Sentencing and Courts Act and the Public Order Act, abolish the Prevent programme, and decriminalise sex work.

  6. 06

    Energy & net zero

    How fast Britain cuts carbon emissions, what it costs, and who bears the cost.

    Capital spending raised by £90bn a year by 2030, of which more than £70bn goes to the green transition. Water, rail and energy companies would be taken into public ownership.

  7. 07

    Education

    Schools, universities and skills — funding, standards and who pays for what.

    No current published position located. This may mean the party has said little on the subject, or that we have not found what it has said — we would rather show the gap than fill it with inference.

  8. 08

    Defence & foreign policy

    Military spending, NATO, the nuclear deterrent and Britain's alliances.

    Immediately begin dismantling Britain's nuclear weapons, cancelling Trident and banning nuclear-armed ships from UK waters, while continuing to recognise NATO's role in European security.

    The combination of remaining in NATO while unilaterally disarming is the most contested element of the platform, since the alliance's strategic concept is explicitly nuclear.

  9. 09

    Europe & the constitution

    The relationship with the EU, membership of international courts, and how power is distributed within the UK.

    Rejoining the European Union is party policy.

  10. 10

    Media & culture

    The BBC, broadcasting, and contested questions of national identity and religious practice.

    No current published position located. This may mean the party has said little on the subject, or that we have not found what it has said — we would rather show the gap than fill it with inference.

Positions are summarised from each party’s published material and reporting of it, not from a full manifesto reading, and platforms move. How we work.

The case each way

Credibility and concerns

What the party can point to, and what is fairly put against it. Both columns are drawn from documented, attributable material — never from our own opinion of the party.

What they can credibly claim

  • First Westminster by-election victory in the party's history, on 41% with a majority above 4,000, pushing Labour into third.
  • Membership passed 200,000 in March 2026, up from roughly 184,000 in December 2025.
  • Polling around 12% nationally — historically high for the party — with five MPs and two peers.

Concerns and open questions

  • Recent averages show the Greens slipping back from their spring peak alongside Reform UK.
  • First-past-the-post converts a 12% national share into very few seats; the party's polling and its parliamentary strength remain far apart.
  • The leadership's sharp leftward turn has been contested within a party that has historically also drawn liberal and rural support.

The team

Frontbench and key figures

  • Mothin Ali — portrait

    Mothin Ali

    Deputy Leader

  • Siân Berry — portrait

    Siân Berry

    MP

    MP for Brighton Pavilion

    Former party leader and London mayoral candidate.

  • Carla Denyer — portrait

    Carla Denyer

    MP

    MP for Bristol Central

    Co-leader of the party until 2025.

  • Adrian Ramsay — portrait

    Adrian Ramsay

    MP

    MP for Waveney Valley

    Co-leader of the party until 2025.

  • Ellie Chowns — portrait

    Ellie Chowns

    MP

    MP for North Herefordshire

  • Hannah Spencer — portrait

    Hannah Spencer

    MP

    MP for Gorton and Denton

    Won the party's first ever Westminster by-election in February 2026.

In the news

Recent developments