Sarah Green is the Liberal Democrat MP for Chesham and Amersham, having first won the seat from the Conservatives in a by-election on 17 June 2021.

In the 2024 general election, Green received 24,422 votes (44.8%). The Conservative candidate received 18,971 votes (34.8%), and the Reform UK candidate secured 5,310 votes (9.8%). Green was duly elected with a majority of 5,451.

The Chesham and Amersham constituency is located in south-east Buckinghamshire and includes the towns of Chesham, Amersham, Gerrards Cross, and villages within the Chiltern Hills Area of Outstanding Natural Beauty. It lies partly within the London commuter belt.

Historically, the constituency was a safe Conservative seat, held by the party from its creation in 1974 until the 2021 by-election. Previous MPs included Conservative cabinet ministers Sir Ian Gilmour (former defence secretary) and Dame Cheryl Gillan (former Welsh secretary).

Dame Cheryl’s death in 2021 triggered the Chesham and Amersham by-election which Green successfully contested.

Political Career

Green is a member of the House of Commons public accounts committee (since October 2024). The PAC is the oldest and arguably one of the most powerful select committees in the House of Commons. Its primary function is to scrutinise the value for money of public spending, ensuring taxpayers’ money is spent wisely. First established in 1857, the committee does not examine the merits of government policy, only the cost and effectiveness of its implementation.

Green previously served as the Liberal Democrat spokesperson for international trade and spokesperson for Wales from July 2022 until September 2024.

Green overturned a 16,000-vote Conservative majority to win the historically ultra-safe Chesham and Amersham seat in the 2021 by-election by 8,028 votes. This represented a massive 25.2% swing from the Conservatives to the Liberal Democrats. Sir Ed Davey, leader of the Liberal Democrats, claimed that Green’s victory signified his party’s emergence as the “main threat” to the Conservatives in such “blue wall” areas.

Appearing alongside Green at a victory rally in the Buckinghamshire constituency, Sir Ed said: “This is a great result, a huge swing to us. There are many Conservatives across the country who are now worried.

“People have been talking about a red wall, well after Chesham and Amersham and Sarah Green’s victory they’ll be talking about a blue wall, and how the Lib Dems are the main threat to the Conservatives.

“People here felt ignored and taken for granted, and we listened. Sarah Green is going to take these concerns to Parliament and hold this appalling Tory government to account.”

In her victory speech, Green said: “Tonight the voice of Chesham and Amersham is unmistakable. Together we have said, ‘enough is enough, we will be heard and this government will listen’.”

She added: “If you wish to reject Conservative mismanagement and vote for a voice that will represent you and stand up for your rights then it is the Liberal Democrats who will continue to fight your corner…

“This Conservative Party has taken people across our country for granted for far too long.

“We will continue the work of holding this government to account for letting Covid rip through the care homes. We will speak up for the three million people excluded from financial support throughout the pandemic and we will challenge Boris Johnson to be far more ambitious in tackling climate change, supporting our frontline workers and backing our small businesses.”

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Amanda Milling, then the co-chair of the Conservative Party, described the result as a “warning shot” by voters over planning reforms for England and the HS2 rail link – which Green and the Liberal Democrats both opposed.

Writing in the Telegraph, former environment secretary Theresa Villiers said the government should see the by-election loss “as an opportunity to rethink their approach to planning reform”.

Green has introduced private members’ bills on issues ranging from environmental protection and women’s rights to parliamentary scrutiny of trade deals:

• The Chalk Streams (Protection) Bill, which she has introduced on three separate occasions since June 2022. Chalk streams are rare habitats; Chesham and Amersham includes several. Green’s bill aims to grant them a special legal status to better protect them from sewage pollution and water abstraction.
• The Trade (Australia and New Zealand) (Parliamentary Approval) Bill, introduced in November 2022. This bill sought to give parliament a binding vote on the post-Brexit trade deals with Australia and New Zealand, reflecting concerns about their potential impact on UK farming and environmental standards.
• The Surgical Mesh (Support) Bill from March 2022. Following the recommendations of the Cumberlege review into patient safety scandals, this bill called for a redress scheme to be established to provide financial compensation for women harmed by surgical mesh implants.
• The State Pension Underpayments (Divorced Women) Bill, also introduced in March 2022, which aimed to compel the department for work and pensions to proactively identify and repay divorced women who had been underpaid their state pension for years due to a major DWP error.

Green is listed as a member of the all-party parliamentary groups (APPG) for first do no harm (concerning medical devices like mesh) and Ukraine.

Green delivered her maiden speech on 7 September 2021 during a debate on the Elections Bill. In it, she said: “There is no evidence of mass voter fraud in this country and yet, with this bill, the government want to introduce voter ID at elections. Why? This bill will result in countless voters being turned away at the polling booth for no good reason.

“We should be encouraging more people to participate in elections, not introducing barriers to voting. Far from strengthening our democracy, this bill makes it harder for people to vote and undermines our independent elections watchdog.

“Like all [MPs] here, I did not enjoy the universal support of every voter, but everyone should be able to cast their vote unimpeded.”

She added: “It goes without saying, however, that, no matter how any one person voted, every constituent in Chesham and Amersham will be listened to, will be heard and their interests represented in this place by me.”

At the 2019 general election, Green helped run the campaign of former attorney general Dominic Grieve, the deselected Conservative MP running as an independent in his Beaconsfield constituency. The Lib Dems did not field a candidate in this contest.

Green previously stood unsuccessfully as the Liberal Democrat candidate for Ynys Môn in the 2005 general election, finishing fifth to Labour incumbent Albert Owen on 2,418 votes (6.8%).

At the 2010 general election, Green contested Arfon – finishing fourth with 3,666 votes (14.1%). Plaid Cymru incumbent Hywel Williams was re-elected.

Political Views

Green was endorsed by local groups of the cross-party organisation Compass during the 2024 general election. Compass is a thinktank and campaign group. As part of its “Win as One” campaign in the 2024 election, local Compass groups backed a slate of progressive candidates who had pledged their support for electoral reform. The central aim of the initiative was to elect a “caucus” of MPs who would champion the cause of replacing the first past the post (FPTP) electoral system.

Brexit and Europe

Customs union vote (2025): In December 2025, Green voted in favour of the UK-EU Customs Union (Duty to Negotiate) Bill. The bill, introduced under the 10-minute rule procedure by Liberal Democrat Europe spokesperson Al Pinkerton, sought to mandate the government to enter into negotiations with the European Union to establish a bespoke customs union. In total, 13 Labour MPs joined the Liberal Democrats in supporting the motion, while the majority of the party abstained.

Electoral reform

Fair elections APPG: Green is listed as a member of the all-party parliamentary group (APPG) for fair elections – a cross-party group of MPs and peers that campaigns for electoral reform. The group’s stated aims include replacing the first past the post (FPTP) voting system with a form of proportional representation, eliminating “dark money” and “undemocratic influence” from politics, and countering disinformation.

Proportional representation bill: In December 2024, Green voted in favour of the Elections (Proportional Representation) Bill – introduced by Liberal Democrat frontbencher Sarah Olney under the 10-minute rule procedure. The bill sought to “introduce a system of proportional representation for parliamentary elections and for local government elections in England”.

A total of 138 MPs supported the bill – with 136 opposed. Notably, 59 Labour MPs backed Olney’s bill.

Introducing the bill, Olney told the House: “First past the post is a broken and unfair system. This summer, the Labour party won a landslide election victory, securing 63% of seats in the House of Commons in return for just 34% of the vote.

“The system leaves millions of voices unheard and creates a divisive, adversarial political climate where collaboration is discouraged and accountability is often sidestepped.”

Assisted dying

Green voted in favour of the Terminally Ill Adults (End of Life) Bill, better known as the assisted dying bill, at both second reading (November 2024) and third reading (June 2025). She was a co-sponsor of the proposed legislation and sat on the public bill committee which scrutinised it.

Writing of her experience on the bill committee in a Buck Free Press column, published June 2025, Green stated: “I have worked with members from across the House, sitting on the committee that scrutinised the legislation, alongside 22 other MPs. This cross-party committee heard evidence from 50 expert witnesses and reviewed the legislation line-by-line.

“Regardless of the outcome, the process was itself historic as no private member’s bill had taken evidence in this way previously. I hope that it might lead to better scrutiny of such legislation in future.”

Social values and conscience issues

Abortion decriminalisation (2025): Green voted in favour of a backbench amendment to the Crime and Policing Bill that sought to decriminalise abortion in England and Wales in June 2025. The amendment, which was passed by a majority of 242 votes, removed women from the threat of prosecution for ending a pregnancy at any stage. As an issue of conscience, MPs were allowed to vote according to their personal beliefs.

Palestine

Ceasefire vote (November 2023): Green voted for a Scottish National Party (SNP) amendment to the king’s speech in the House of Commons calling for an “immediate ceasefire” in the Israel-Hamas war. Labour had tabled a rival motion, making a more moderate appeal for a “humanitarian pause” in the conflict.

Civil liberties

Covid passes vote (2021): Green was one of 126 MPs to vote against Covid passes in England in December 2021. The measure, introduced by Boris Johnson’s government, was carried by 369 votes to 126.

Before Politics

Born Sarah Louise Green in Corwen, North Wales, on 25 April 1982, she grew up in the area. She studied at Aberystwyth University and Manchester Metropolitan University.

She is a fluent Welsh speaker and was chair of the Welsh Young Liberals during her time at Aberystwyth.

Before entering politics full-time, Green worked in market research, including roles at Euromonitor International and Kantar TNS. In 2014, she founded Green and Ginger, a marketing and communications company.

Personal Life

Green lives in Chesham with her partner, Daniel, and Labrador, Angus.

Trivia

One of Chesham and Amersham’s most famous residents was author Roald Dahl.

In her 2021 maiden speech, referencing her opposition to HS2, Green stated: “Chesham and Amersham is something of a destination for Welsh émigrés. One of our most famous late residents was Roald Dahl.”

She added: “There is therefore a grim and unwelcome parallel between the story of Fantastic Mr Fox and the scene that greets people there today. The damage that Boggis and Bunce and Bean’s diggers wrought as they tore up the land while hunting that Mr Fox echoes the current destruction now taking place thanks to the works around High Speed 2.”