Copyright © 2026 OyList. All Rights Reserved.
Share
Items22
1
1962 Orpington by-election
The Liberals took a Conservative seat in suburban Kent on March 14, 1962, turning a Tory majority of 14,760 into a Liberal one of 7,855 for Eric Lubbock. The result is often described as the start of the Liberal revival, and the press conjured up "Orpington man," the commuter voter who had drifted away from Harold Macmillan's Conservatives.
Start here to see where the modern pattern began: a third party using one by-election to tell the whole country it is back in the game.
More about 1962 Orpington by-election2
1965 Leyton by-election
Labour lost a supposedly safe east London seat on January 21, 1965, and with it a Foreign Secretary. Patrick Gordon Walker had been beaten at Smethwick in the 1964 general election, and Leyton was meant to carry him back into the Commons. Instead the Conservative Ronald Buxton won by 205 votes, and Gordon Walker resigned from the Foreign Office.
It remains the cautionary tale for any party tempted to parachute a minister into a vacancy: voters dislike being treated as a formality. Gordon Walker did win Leyton back at the 1966 general election.
More about 1965 Leyton by-election3
1966 Carmarthen by-election
Gwynfor Evans became the first Plaid Cymru member of parliament on July 14, 1966, winning by 2,436 votes in the contest that followed the death of Labour MP Megan Lloyd George.
One seat in west Wales did not change the arithmetic at Westminster, but it changed what Welsh nationalism believed was possible. The result is treated as a seminal moment for the movement, and it sits at the start of the road that led to the Welsh Assembly in 1999.
More about 1966 Carmarthen by-election4
1967 Hamilton by-election
Winnie Ewing took Hamilton for the SNP on November 2, 1967, in a seat where Labour had won more than two-thirds of the vote at every general election since 1945. Her majority was 1,799, and her line to the crowd after the declaration, "Stop the world, Scotland wants to get on," became the night's lasting slogan.
Read it alongside Carmarthen: within 16 months, both Welsh and Scottish nationalism had won a seat at Westminster, and Labour's grip on its Celtic heartlands no longer looked permanent.
More about 1967 Hamilton by-election5
1981 Crosby by-election
Shirley Williams became the first MP elected under the SDP label on November 26, 1981, overturning a Conservative majority of 19,272 in a safe seat on Merseyside. She took almost half the vote, and both the Conservatives and Labour fell by more than 15 points.
Her verdict that night, that there was no safe seat left in the country, captured the brief moment when the new party looked capable of breaking the two-party system altogether.
More about 1981 Crosby by-election6
1982 Glasgow Hillhead by-election
Roy Jenkins won Glasgow Hillhead for the SDP on March 25, 1982, taking a Conservative seat with 33.4% of the vote and a majority of 2,038 after the death of Tam Galbraith.
The win put the SDP's best-known founder back in the Commons, and he narrowly won the party's leadership that July. It is the clearest example of a by-election used as a launch pad for a leader, a playbook that returned 44 years later in Makerfield.
More about 1982 Glasgow Hillhead by-election7
1983 Bermondsey by-election
Simon Hughes won this south London seat for the Liberals on February 24, 1983, on a swing of 44.2%, described as the largest by-election swing in British political history. Labour had held Bermondsey since 1946 and took 63.6% there in 1979; this time it fell to 26.1%.
The campaign is remembered as much for how it was fought. Labour's candidate, Peter Tatchell, faced homophobic graffiti, abuse and attacks, and the contest has been called the dirtiest in modern British politics. Hughes went on to represent Bermondsey and its successor seats for 32 years.
More about 1983 Bermondsey by-election8
1990 Eastbourne by-election
The vacancy came from tragedy: Conservative MP Ian Gow was killed by a Provisional IRA car bomb in July 1990. The Conservatives had held Eastbourne by more than 16,000 votes in 1987, yet on October 18, 1990, the Liberal Democrat David Bellotti took it with 50.8%.
The shock is credited with contributing to the end of Margaret Thatcher's premiership the following month, because Conservative MPs began to fear for their own seats if she stayed. Few by-elections have a more direct line to a change of prime minister.
More about 1990 Eastbourne by-election9
1991 Ribble Valley by-election
Ribble Valley in Lancashire had a Conservative majority of 19,528 when David Waddington went to the House of Lords. On March 7, 1991, the Liberal Democrat Michael Carr won it at his third attempt, with the opposition parties campaigning hard against the poll tax.
The tax was abolished soon afterwards by John Major's government, which makes this a rare by-election tied closely to a policy retreat. The Conservatives took the seat back in 1992, a useful reminder that a by-election message does not always survive a general election.
More about 1991 Ribble Valley by-election10
1993 Christchurch by-election
Diana Maddock won Christchurch for the Liberal Democrats on July 29, 1993, with 62.2% of the vote after the death of Conservative MP Robert Adley. The swing of about 35% was the largest against any British government since 1918.
It arrived little more than a year after John Major's surprise general election win and showed how quickly that recovery had drained away. The Conservatives won Christchurch back in 1997, but the Liberal Democrats took a string of other safe Conservative seats in the south of England that year.
More about 1993 Christchurch by-election11
2003 Brent East by-election
Sarah Teather took Brent East from Labour on September 18, 2003, on a 29% swing, overturning a Labour majority of 13,047 after the death of MP Paul Daisley.
Commentators linked the result to traditional Labour voters' anger over the Iraq War, and it was widely read as an early verdict at the ballot box on Tony Blair's decision. It was also the largest swing from Labour to the Liberals or Liberal Democrats since Bermondsey in 1983.
More about 2003 Brent East by-election12
2008 Crewe and Nantwich by-election
Edward Timpson won this Cheshire seat for the Conservatives on May 22, 2008, after the death of Labour veteran Gwyneth Dunwoody, on a swing of 17.6%. It was the first seat the Conservatives had gained at a by-election since Mitcham and Morden in 1982.
Labour ran a class-based campaign, with jibes such as "Tory Boy Timpson," and it did not stop the swing. The defeat came amid a backbench revolt against Gordon Brown over the abolition of the 10p tax rate, and it suggested David Cameron's party could take Labour seats again.
More about 2008 Crewe and Nantwich by-election13
2008 Glasgow East by-election
Two months after Crewe, Labour lost the third-safest Labour seat in Scotland. The SNP's John Mason won Glasgow East on July 24, 2008, beating Labour's Margaret Curran by just 365 votes and overturning a Labour majority of 13,507 after David Marshall stood down on health grounds.
Coming straight after Crewe, it turned murmurs about Gordon Brown's leadership into open pressure, and it showed that the SNP could win in the heart of Labour's Glasgow.
More about 2008 Glasgow East by-election14
2012 Bradford West by-election
George Galloway won Bradford West for Respect on March 29, 2012, with a majority of 10,140 in a seat Labour had held by 5,763 two years earlier. He called it the "Bradford Spring."
It was the first time the main opposition party had lost a seat at a by-election since Romsey in 2000, and Respect's 52.8-point rise in vote share was the second-highest in recorded UK by-election history. The lesson for any opposition: being out of power does not make a safe seat safe.
More about 2012 Bradford West by-election15
2014 Clacton by-election
Douglas Carswell defected from the Conservatives to UKIP and resigned his seat to seek a fresh mandate. On October 9, 2014, Clacton gave him 59.7% of the vote, making him UKIP's first elected MP, and Mark Reckless repeated the move at Rochester and Strood that November.
The two defections sharpened Conservative fears of UKIP before the 2015 general election, which the Conservatives fought on a promise of the EU referendum held in June 2016. Carswell's win showed UKIP could take a seat under first past the post, not just poll well.
More about 2014 Clacton by-election16
2021 Hartlepool by-election
The Conservatives won Hartlepool on May 6, 2021, with 51.9% of the vote and a majority of 6,940, taking a seat Labour had held since 1964. The swing toward a sitting government was the largest at any post-war by-election.
The result showed that the "red wall" break of 2019 had not reversed, and it was widely seen as a blow to Keir Starmer, with parts of Labour's left reading it as a rejection of his centrist approach. The vacancy itself followed Labour MP Mike Hill's resignation over sexual harassment allegations.
More about 2021 Hartlepool by-election17
2021 North Shropshire by-election
Helen Morgan won North Shropshire for the Liberal Democrats on December 16, 2021, overturning Owen Paterson's majority of 22,949 on a swing of about 34%. Paterson had resigned after being found to have breached paid advocacy rules.
The row over his case, joined by the partygate revelations of the weeks before polling day, turned a rural contest into a verdict on Boris Johnson. It was the first time anyone but a Conservative had won the seat since 1904.
More about 2021 North Shropshire by-election18
2022 Tiverton and Honiton by-election
Richard Foord's Liberal Democrat win in Devon on June 23, 2022, overturned a Conservative majority of 24,239, thought to be the largest ever overturned at a by-election. The vacancy arose after Conservative MP Neil Parish admitted watching pornography in the Commons chamber.
Labour took Wakefield from the Conservatives on the same night. Party chairman Oliver Dowden resigned the next morning, writing that somebody must take responsibility, and less than two weeks later, after a wave of ministerial resignations, Boris Johnson announced he would step down.
More about 2022 Tiverton and Honiton by-election19
2023 Mid Bedfordshire by-election
Labour's Alistair Strathern won Mid Bedfordshire on October 19, 2023, the party's first victory in a seat created in 1918 and held by the Conservatives since 1931. Nadine Dorries had won it with a majority of 24,664 in 2019, then announced she was leaving in June 2023 and delayed her formal resignation until late August.
Labour gained Tamworth the same night. Winning in Conservative Bedfordshire, not only in the north, told the country that Labour was competing across the whole map before the 2024 general election.
More about 2023 Mid Bedfordshire by-election20
2025 Runcorn and Helsby by-election
Reform UK's Sarah Pochin won Runcorn and Helsby on May 1, 2025, by six votes after a recount, the closest British post-war by-election result. Labour had won the seat by 14,696 at the general election less than a year earlier, and the vacancy followed Labour MP Mike Amesbury's conviction for assault.
It was the first by-election of Keir Starmer's government, and Pochin became the first non-Labour MP elected in Runcorn in over 50 years. The result was widely read as a sign that Reform threatened Labour's own heartland seats, not just a protest vote.
More about 2025 Runcorn and Helsby by-election21
2026 Gorton and Denton by-election
Hannah Spencer won Gorton and Denton on February 26, 2026, giving the Greens their first by-election win. She took 40.6% in a Manchester seat where Labour had won over half the vote in 2024; Reform came second and Labour a bruising third on 25.4%.
There was a backstory too: Labour's National Executive Committee had blocked Andy Burnham from standing. The result added to the mounting pressure on Keir Starmer, and it showed Labour being squeezed from the left and the right in the same seat on the same night.
More about 2026 Gorton and Denton by-election22
2026 Makerfield by-election
Andy Burnham, then Mayor of Greater Manchester, won Makerfield for Labour on June 18, 2026, after the sitting MP Josh Simons stood down so that Burnham could return to Parliament and challenge Keir Starmer. Reform had won all eight Makerfield wards in that spring's council elections, yet Burnham took 54.8% and a majority of 9,231.
Four days later Starmer announced he would resign as Labour leader, and Burnham became prime minister on July 20, 2026. It is the rare by-election that led straight to Downing Street.
More about 2026 Makerfield by-election
