Green Party Manifesto Analysed: 14 Policies Fact-Checked Against International Evidence

They Say: The wealthiest 1% own more than the bottom 70% combined. A modest 1–2% levy is a small ask from those who have benefited most.

We Say: The appeal to fairness is understandable, but the mechanism is fatally flawed. Norway tried exactly this and lost $54bn in wealth. The tax raised $146m but cost $594m in net revenue. The wealthy have the means and advisers to move. The UK cannot build a wall around capital.

They Say: France's wealth tax raised billions for years. The idea that it doesn't work is a myth spread by those who benefit from the status quo.

We Say: France's own economists disagree. Eric Pichet calculated the ISF caused €200bn in capital flight and cost France almost twice as much in lost revenue as it generated. That is why President Macron — a centrist — abolished it in 2017.

They Say: We would introduce robust anti-avoidance measures and work internationally to close loopholes.

We Say: 12 of the 14 OECD countries that once had wealth taxes have since abolished them, citing administrative complexity, low yields, and capital flight. The UK would be attempting something the vast majority of comparable nations have already tried and abandoned.

They Say: The rich are getting richer while everyone else struggles. The current system clearly isn't working.

We Say: Look at the ONS data. Before any tax is collected, the top 20% earn about 14 times more than the bottom 20%. After the current tax and benefits system does its work, that gap falls to just 3.7 times. The Gini drops from 50.1% to 29.8%. That is not a system that is doing nothing. That is one of the most aggressive redistribution machines in the developed world, already running. The Green Party is not proposing to start redistributing. They are proposing to push a system that is already working hard even further, using a mechanism that Norway and France both tried and both abandoned because it drove the very people who fund the redistribution out of the country. If the top earners leave, the 3.7:1 ratio does not get better. It gets worse, because the money that was being redistributed disappears with them.

They Say: The richest can afford to pay more. They won't even notice it.

We Say: The top 1% already pay 28.5% of all income tax. The top 10% pay 60%. The bottom 50% pay under 10%. The system is already enormously progressive. But the real issue is not whether they can afford it. It is whether they will stay and pay it. As Levitt and Dubner put it in Freakonomics: people respond to incentives. When Labour introduced the 50p rate in 2010, HMRC found it raised just £0.6bn of the £2.6bn forecast, because high earners shifted income, deferred gains, and changed behaviour. When it was cut back to 45p, HMRC estimated the cost was only £100m, because the behavioural response had already eroded 97% of the theoretical revenue. You can set whatever rate you like on paper. What matters is what people actually do in response.

They Say: If people earn over £100k they are rich enough to pay more. A wealth tax just extends that principle.

We Say: People earning £100k-£125k already face an effective 62% marginal tax rate because the personal allowance is withdrawn at £1 for every £2 earned. They keep just 38p of each extra pound. IFS research shows workers are deliberately keeping their earnings just below £100k to avoid this trap: reducing hours, turning down overtime, and diverting income into pensions rather than earn into that band. Data from the Deel platform shows taxable pay clusters sharply below £100k, especially among parents who would also lose 30 hours free childcare. This is not abstract economics. It is 1.8 million real people already responding to incentives by working less. Making the system even more aggressive does not mean the wealthy pay more. It means more people stop trying.

They Say: Trident costs over £3bn a year. That money could fund thousands of nurses and teachers.

We Say: The Dreadnought programme costs ~£1.5bn per year spread over two decades — less than 0.2% of total government spending. No amount of nurses or teachers can substitute for the function of a nuclear deterrent. The question is not whether we can afford it; it is whether we can afford not to have it.

They Say: Nuclear weapons are immoral weapons of mass destruction. No civilised country should possess them.

We Say: Ukraine made a similar moral calculation in 1994 and gave up the world's third-largest nuclear arsenal. Russia invaded in 2022. Moral arguments are cold comfort when facing an adversary that does not share them.

They Say: We would work within NATO to pursue multilateral disarmament.

We Say: Russia possesses ~6,000 nuclear warheads and is actively modernising. China is rapidly expanding. North Korea continues to develop ICBMs. There is no credible pathway to multilateral disarmament. Unilateral disarmament is not a peace strategy; it is a security gamble with 67 million lives.

They Say: Nuclear weapons are relics of the Cold War. Britain's influence comes from diplomacy, aid, and soft power, not bombs.

We Say: Nuclear status is soft power. Chatham House confirms the UK enjoys "an outsized profile" in NATO and Five Eyes partly because of nuclear possession. It is the only European state assigning nuclear forces to NATO collective defence, giving Britain unique weight in alliance strategy. The 2025 UK-France Northwood Declaration positions Britain as a "nuclear bridge" between Washington and Paris. All five permanent UN Security Council members are nuclear-armed. Aneurin Bevan, a Labour founder, warned in 1957 against unilateral disarmament: it would mean "sending the Foreign Secretary naked into the conference chamber." The deterrent is not separate from diplomacy. It underpins it.

They Say: Nuclear power is dangerous and produces radioactive waste that lasts thousands of years. We should invest in wind and solar instead.

We Say: Nuclear produces 0.03 deaths per TWh — comparable to wind and solar, and 820 times safer than coal. Germany's nuclear phase-out led to increased coal burning, causing $12bn in social costs per year according to NBER research. The fear of nuclear is not supported by the mortality data.

They Say: Renewables are now cheaper than nuclear. We don't need it.

We Say: Renewables are cheaper per MWh in ideal conditions, but they are intermittent. Nuclear provides ~90% capacity factor versus 35-45% for offshore wind. Replacing nuclear with renewables requires massive investment in grid-scale battery storage and backup generation — costs rarely included in simple cost-per-MWh comparisons.

They Say: Water companies have paid out £88bn in dividends while pumping raw sewage into our rivers. Public ownership would end this extraction.

We Say: The anger is entirely justified. However, nationalisation would cost £100bn upfront and inherit £60bn+ in debt. That investment burden falls entirely on the taxpayer. The problem is failed regulation, not ownership per se — and better regulation is far cheaper than nationalisation.

They Say: Public ownership works. Look at Germany's publicly owned energy companies or France's state-owned rail.

We Say: Germany's energy sector is in crisis following the nuclear phase-out. France's SNCF is heavily subsidised and regularly disrupted by strikes. British Rail — the nationalised predecessor — saw falling passenger numbers and chronic underinvestment. Passenger numbers doubled after privatisation.

They Say: Rents have increased by 50% in five years. Tenants are being priced out of their homes. Rent controls are a necessary emergency measure.

We Say: The pain is real, but rent controls treat the symptom rather than the disease. Scotland introduced a rent freeze in 2022. Landlords exited the market, supply fell, and rents surged when properties were re-let. Scottish tenants are now more likely to face a rent increase than those in England — the opposite of what the policy intended.

They Say: We are also proposing to build 150,000 social homes per year, which will address the supply problem.

We Say: Building 150,000 social homes per year is genuinely the right approach. However, the UK has not built anywhere near that number in any recent year. Combining an ambitious but uncertain supply target with a demand-side rent control that immediately reduces supply is a high-risk combination.

They Say: The UK's four-day week pilot showed productivity was maintained or improved in 92% of participating companies. Workers were healthier and happier.

We Say: The pilot involved 61 self-selected white-collar companies. Mandating a four-day week across the entire economy ignores sectors like hospitality, healthcare, manufacturing, and retail, where physical presence and continuous cover are required. For these sectors, a mandatory four-day week means either hiring more staff (increasing costs) or compressing the same work into fewer hours (increasing stress).

They Say: A £15 minimum wage would lift millions out of poverty and put more money into the pockets of those who spend it locally.

We Say: The principle is sound, but the rate for all ages is the problem. UK youth unemployment reached a 10-year high of 16.1% in Q4 2025, partly attributed to recent rapid minimum wage increases. Extending £15 to 18-year-olds represents a near 75% increase, which risks making it uneconomic for employers to hire and train young people.

They Say: UBI would eliminate the poverty trap, reduce welfare bureaucracy, and give people the freedom to retrain, care for family members, or start businesses.

We Say: These are genuine benefits. The problem is cost. A meaningful UBI for all UK adults would cost £530bn per year — more than double the entire current welfare budget. Finland's trial found minimal employment effects. The policy is either too small to matter or too expensive to fund.

They Say: UBI would be funded by replacing the existing complex welfare system, which wastes billions on administration.

We Say: The UK welfare system costs £260bn per year. A UBI at even £10,000 per year for every adult would cost £530bn. Abolishing the existing system to fund UBI would leave the most vulnerable — those with disabilities, caring responsibilities, and complex needs — significantly worse off, since their current benefits are targeted and higher than any politically feasible UBI rate.

They Say: Aviation is responsible for 2.5% of global CO2 emissions and a much higher proportion of total warming effects. We cannot meet our climate targets while expanding airports.

We Say: The climate case for reducing aviation emissions is legitimate. However, France's domestic flight ban affected only 3 routes and reduced emissions by less than 1%. Northern Ireland has no land border with Great Britain and is critically dependent on domestic air connectivity. These policies harm regional economies while achieving minimal climate benefit.

They Say: A frequent flyer levy is fair because it targets those who fly the most, who are overwhelmingly the wealthiest.

We Say: The distributional argument has merit. But UK aviation supports 1.6 million jobs and contributes £100bn to GDP. Business travel underpins export contracts and inward investment that cannot simply be replicated over video calls. The economic cost of restricting aviation is far higher than the climate benefit of these specific measures.

They Say: Asylum seekers are not allowed to work for up to 12 months. They are forced into destitution and dependency. Allowing them to work immediately would save money and let them contribute.

We Say: This is actually one of the stronger arguments in the Green Party's immigration platform. The NIESR found it would raise £1.3bn in tax revenue and save £6.7bn in expenditure. The right to work is well-evidenced. The problem is the broader platform — abolishing all detention and ending NRPF — which goes much further and carries significant fiscal risks.

They Say: Ending the hostile environment would save money by reducing the bureaucratic cost of enforcement and detention.

We Say: Immigration detention costs are real, but they exist because the alternative — releasing everyone with no enforcement mechanism — creates a pull factor that increases overall numbers. The Home Office spent £3bn+ per year on asylum operations. Abolishing the deterrent framework without a credible alternative risks increasing that cost, not reducing it.

They Say: No young person should be deterred from going to university by the fear of £50,000 of debt. Free tuition would open up higher education to everyone.

We Say: Scotland has had free tuition since 2000. Young Scots from deprived areas are still four times less likely to attend university than those from wealthy backgrounds. Free tuition benefits the wealthy most because they are more likely to go to university in the first place. The IFS estimates abolishing fees in England would cost £10bn+ annually, with the primary beneficiaries being graduates who go on to earn well above average salaries.

They Say: The current loan system is a graduate tax in all but name. Most graduates will never repay their full loan. The system is dishonest.

We Say: This critique of the current system has genuine merit. But the solution is not to shift the entire cost to the general taxpayer — including those who do not go to university and earn less than graduates on average. Better targeted maintenance grants for the poorest students would achieve more social mobility at a fraction of the cost.

They Say: A carbon tax is the most economically efficient way to reduce emissions. It puts a price on pollution and lets the market find the cheapest way to decarbonise.

We Say: The economic theory is sound. The problem is the rate and the distributional impact. At £120/tonne — three times the current UK ETS price — the tax hits the poorest households hardest because they spend a larger share of income on energy and fuel. The IFS noted that raising £90bn from a carbon tax would be "impossible without the effect being felt by everyone."

They Say: The revenue from the carbon tax would fund green investment and insulate homes, ultimately reducing energy bills for the poorest.

We Say: The intention is good but the sequencing is the problem. The tax hits immediately; the benefits of insulation take years. In the interim, lower-income households face higher energy bills. There is also a serious competitiveness risk: a unilateral carbon tax at £120/tonne, far above competitor nations, risks driving energy-intensive industries to relocate, achieving nothing for the global climate while destroying UK jobs.

They Say: Brexit has cost the UK economy 6-8% of GDP. Rejoining the EU would reverse this damage and restore our trading relationships and freedom of movement.

We Say: The economic costs of Brexit are real and well-documented. However, rejoining requires accepting the full acquis communautaire including the obligation to work towards adopting the Euro, free movement, and net budget contributions of £8-10bn per year. The political conditions — requiring a referendum and sustained parliamentary majority — do not currently exist.

They Say: Rejoining the Single Market, even without full EU membership, would recover most of the economic benefits.

We Say: Norway and Switzerland have Single Market access but must accept free movement, pay budget contributions, and accept EU rules with no vote on making them. This is the "rules taker, not rules maker" arrangement that many Brexit supporters specifically objected to. The Green Party's own policies — a carbon tax far above the EU's — would create new trade frictions even within a rejoined framework.

They Say: The UK is one of the most nature-depleted countries in the developed world. We have lost 50% of our biodiversity since 1970. Setting aside 30% of land for nature is essential to prevent ecological collapse.

We Say: The biodiversity crisis is real and urgent. However, the UK already imports nearly half its food. Taking 30% of agricultural land out of productive use would reduce domestic food production, increase import dependency, and drive up food prices — hitting lower-income households hardest. The policy risks exporting the environmental problem rather than solving it, as food production moves to countries with lower environmental standards.

They Say: Rewilding creates jobs in eco-tourism, conservation, and sustainable land management that can replace agricultural employment.

We Say: Eco-tourism jobs are real but seasonal, lower-paid, and geographically concentrated. They cannot straightforwardly replace the skilled agricultural workforce in rural communities. The transition costs — retraining, relocation, and economic shock to rural communities — are substantial and largely uncosted in the Green Party's proposals.

They Say: No one should have to sell their home to pay for care in old age. Free personal care is a mark of a civilised society and Scotland has shown it can be done.

We Say: Scotland introduced free personal care in 2002 and the principle is admirable. However, Audit Scotland found funding failed to keep pace with demand within years, leaving councils with £46-63m annual shortfalls. Councils tightened eligibility criteria, meaning many people who were supposed to benefit did not qualify. The cost was systematically underestimated.

They Say: The £20bn we propose to spend on social care is a genuine investment that will save money in the long run by preventing more expensive hospital admissions.

We Say: The preventative argument has genuine merit. However, England already spends £20bn+ per year on adult social care and faces a £3.4bn funding gap just to maintain existing standards. The Green Party's £20bn is therefore not a net addition to a functioning system; it is the minimum needed to address an existing crisis. The question is whether the funding mechanism — primarily wealth taxes — can reliably deliver that revenue, given the evidence from Norway and France.