• On Thursday, millions of citizens in Britain will vote for a new House of Commons and a new government.
• The current prime minister, Rishi Sunak, and his Conservative party are widely expected to lose to the main opposition party, the left-of-center Labour party.
• Other parties running include the Liberal Democrats, the populist Reform UK party, the Scottish National Party, and the environmentalist Green Party.

Millions of voters in Britain are going to the polls Thursday to choose a new House of Commons and a new government.

Voters will elect 650 lawmakers representing as many constituencies, or local areas, and the leader of the party that returns the most lawmakers will become prime minister.

Prime Minister Rishi Sunak’s Conservatives are widely expected to lose to the main opposition party, the left-of-center Labour, after 14 years in power under five different prime ministers.

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The Conservatives and Labour traditionally dominate British politics under the U.K.’s “first past the post” electoral system, which makes it difficult for smaller parties to win representation in Parliament.

But also in the running are the Liberal Democrats, Reform UK, the Scottish National Party and the Greens, among others.

Here’s a look at the parties, who’s leading them and what they are promising:

CONSERVATIVES

Who is the leader of the British Conservative party?

Prime Minister Rishi Sunak.

Sunak, 44, came to power in October 2022 when he inherited a Conservative Party and an economy in turmoil after Liz Truss’s short-lived premiership. The Oxford graduate and former Goldman Sachs hedge fund manager is Britain’s first leader of color and the first Hindu to become prime minister. Sunak has stressed he is the man who steadied the ship, but critics say he lacks political judgment and is out of touch with ordinary voters.

How many seats did the Conservatives win in the last election?

365

What are the Conservatives promising?

Delivering a stronger economy and cutting taxes by some 17 billion pounds per year. Increasing public health spending above inflation, and boosting defense spending to 2.5% of GDP by 2030. The party says this will be paid for by savings on tax evasion and slashing welfare spending. The party also pledges to cap immigration numbers and remove some asylum-seekers to Rwanda.

LABOUR

Who is the leader of the British Labour party?

Keir Starmer.

The 61-year-old lawyer, a former chief prosecutor for England and Wales, is the current favorite to be Britain’s next leader. A centrist and pragmatist, Starmer has worked hard to steer his party away from the more overtly socialist policies of former leader Jeremy Corbyn and quelled internal divisions. Critics call him unexciting and unambitious, but Labour has surged in popularity under his leadership.

How many seats did the Labour party win in the last election?

202

What is the Labour party promising?

Promoting “wealth creation,” encouraging investment and improving Britain’s infrastructure like railways under a 10-year infrastructure strategy. Setting up a state-owned clean power company to boost energy security, paid for by a windfall tax on oil and gas giants. Taxing private schools to pay for thousands of new teachers in state schools. Cutting record-high public health waiting times.

LIBERAL DEMOCRATS

Who is the leader of the British Liberal Democrats?

Ed Davey.

Davey, 58, was first elected to Parliament in 1997. The former economics researcher served as the government’s energy and climate change secretary under an uneasy Conservative-Liberal Democrat coalition from 2012 to 2015. Davey became leader of the left-of-center Lib Dems in 2019 and was not a household name until this election, when he made headlines with multiple zany stunts — including bungee-jumping to urge voters to take “a leap of faith.”

How many seats did the Liberal Democrats win in the last election?

11

What are the Liberal Democrats promising?

Improving Britain’s overstretched health and social care systems, including introducing free nursing care at home. Investing in renewable energy and home insulation. Clamping down on sewage-dumping water companies. Lowering the voting age to 16. Rejoining the European Union’s single market.

REFORM UK

Who is the leader of Reform UK?

Nigel Farage.

Farage, a political firebrand who takes pride in being the disruptor in British politics, has posed a serious headache to the Conservatives since he announced he is running in the election. The 60-year-old populist has long divided opinion with his anti-migrant rhetoric and Euroskeptic stance. A key proponent of Brexit, Farage is capturing many disillusioned Conservative voters with his promises to cut immigration and focus on “British values.” Farage previously ran for Parliament seven times but never won.

How many seats did Reform UK win in the last election?

None — though the party gained its first lawmaker this year when ex-Conservative Party deputy chair Lee Anderson defected to Reform.

What is Reform UK promising?

Freezing all “nonessential immigration” and barring international students from bringing their dependents with them. Leaving the European Convention on Human Rights so that asylum-seekers can be deported without interventions from rights courts. Scrapping “net zero” goals to reduce greenhouse gas emissions in order to bring down energy bills.

SCOTTISH NATIONAL PARTY (SNP)

Who is the leader of the Scottish National Party?

John Swinney.

Swinney, 60, became the SNP’s third leader in just over a year in May. The politician has sought to bring stability to the party, which has been in turmoil since Scotland’s long-serving First Minister Nicola Sturgeon abruptly stepped down last year during a campaign finance investigation that eventually led to criminal charges against her husband. Swinney has long served the party: he joined its ranks at 15 years old, and previously led the party from 2000 to 2004.

How many seats did SNP win in the last election?

48

What is the Scottish National Party promising?

Swinney has said that if his party wins a majority of seats in Scotland he will try to open Scottish independence negotiations with the London-based U.K. government. He wants to rejoin the European Union and the European single market. He also called for boosting public health funding, scrapping the U.K.’s Scotland-based nuclear deterrent, and an immediate cease-fire in Gaza.

GREEN PARTY

Who leads the Green Party?

Carla Denyer and Adrian Ramsay.

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Denyer, a mechanical engineer, worked in wind energy before she joined the Greens in 2011. The 38-year-old served as a local politician for the southwestern English city of Bristol for nine years. In 2021 she was elected co-leader of the Greens along with Ramsay, also a local government politician who has experience working with environmental charities.

How many seats did the Greens win in the last election?

1

What is the Green Party promising?

Phasing out nuclear power and getting the U.K. to net zero by 2040. The Greens have pledged 24 billion pounds a year to insulate homes and 40 billion pounds a year invested in the green economy, to be paid for by a carbon tax, a new wealth tax on the very rich and an income tax hike for millions of higher earners.