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Four-and-a-half years ago, Britain’s Labour Party suffered its worst election defeat since 1935. The historic election victory of Boris Johnson in 2019 – which allowed him to finally implement Brexit – was supposed to mark another 10 years of Conservative rule in Britain, with Labour resigned to rebuild on the fringes of politics.

Then Labour leader, the hard-left Jeremy Corbyn, was forced to resign and reluctantly hand his party to the centrist Keir Starmer, a former lawyer, knight of the realm and exactly the type of establishment figure that Corbyn and the far-left despise.

In little over four years, Starmer has pulled off a once-impossible coup and dragged his Labour Party from the margins of British politics to a thumping victory in Thursday’s general election.

It will be the first time Labour has been in power since 2010 and the first time it has entered power from opposition since Tony Blair’s historic win in 1997.

Addressing the nation before entering 10 Downing Street Friday afternoon, Starmer pledged a return to the politics of public service, vowing to heal the “weariness at the heart of the nation” with “action not words.”

It was clear going into this election campaign that Britain was screaming out for change after 14 years of Conservative rule that saw cuts in public spending, stretched public services, the chaos of Brexit, a cost-of-living crisis and a sitting prime minister fined by police while in office for the first time in history.

Starmer, who had led the opinion polls since October 2021, has promised to be the agent of change that Britain wants. During the campaign, he pledged to grow the country’s economy by reforming planning laws and investing in a new industrial strategy. He said he will set up a national wealth fund with £7.3 billion ($9.3bn) of public money that will help pay for the transition to net zero emissions.

An £8.3 billion ($10.5 billion) publicly owned energy company, Great British Energy, will see the United Kingdom’s energy grid decarbonized by 2030. Starmer says all this can be achieved without raising income taxes, though there are no commitments on other levies, such as capital gains tax, which is paid on money made from selling assets, including property and shares.

The rest of the Labour manifesto comprised a mix of modest centrism with soft socialism. It included imposing taxes on private schools to help pay for state education and windfall levies on energy companies to fund the transition to clean energy. There were also commitments on workers’ rights, cutting waiting lists for health care and also controlling immigration.

Critics on the right say that Starmer will need to raise taxes to fund his plans, while skeptics on the left say his manifesto is not bold or ambitious enough to change Britain for the better.

In short, this is a long list of things to sort out in a five-year term when public finances are in disarray. The question for Starmer now is whether the mess is too big for him to fix and whether he has the political skill to bring about the change he promised.

Who is Keir Starmer?

On paper, the 61-year-old Starmer looks like a classic establishment figure.

Once a leading human rights lawyer, he became Director of Public Prosecutions (DPP) in 2008, running the Crown Prosecution Service of England and Wales – a high-profile job for which he was knighted, making him the first ever Labour leader to enter the job with the prefix Sir to their name.

Starmer, however, is - by the standards of modern political leaders - from relatively humble beginnings.

Born in 1962, Starmer grew up in a small town to the south of London. His father was a toolmaker who worked in a factory, his mother was a nurse who suffered with severe physical disabilities, which ultimately led to one of her legs being amputated.

While Starmer has never claimed to have suffered poverty, he has talked of financial struggles that affected his family, as well as the learning difficulties that held back his younger brother.

Clearly, these early experiences shaped Starmer’s politics. He has talked about noticing people looking down on his father for working in a factory or bullying his brother. His parents were political, naming their eldest after the first Labour leader in parliament, Keir Hardie.

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Labour leader Keir Starmer addresses supporters in London on Friday, July 5, after his party won the general election in a landslide.
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Starmer, as director of public prosecutions, makes a statement to the media in London in 2010. He was later knighted for the job he did running the Crown Prosecution Service of England and Wales.
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Starmer arrives at London's High Court in 2012 to give evidence at the Leveson Inquiry, which looked into the culture, practices and ethics of the media.
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Starmer, right, campaigns for Parliament in April 2015. He was the Labour Party candidate in the London constituency of Holborn and St Pancras. He was elected the next month.
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Starmer appears on "The Andrew Marr Show" with then-Foreign Secretary Boris Johnson in 2016. Labour leader Jeremy Corbyn made Starmer the party's shadow Brexit spokesperson following the 2016 referendum. In the UK, the main opposition party has "shadow" ministers who hold political portfolios.
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Starmer delivers a speech at Chatham House in London in March 2017, just before Prime Minister Theresa May sent a letter to European Union leaders to announce the start of departure negotiations. "While Labour did not support leaving the European Union and I campaigned passionately against it, we have accepted that that choice was made and that it will now be delivered," Starmer said while laying out the party's vision for the future.
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Starmer campaigns with Labour's Nia Griffith in Pembrey, Wales, in May 2017. Both were re-elected to Parliament.
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Starmer addresses the Labour Party Conference in Brighton, England, in September 2017.
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Starmer tours the technology training facility at Birmingham City University in Birmingham, England, in March 2018.
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Starmer signs a poster for a delegate during the Labour Party Conference in Liverpool, England, in September 2018.
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Starmer, left, and then-Labour Party leader Jeremy Corbyn leave together after a meeting with the European Union's chief Brexit negotiator in Brussels, Belgium, in March 2019.
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Starmer addresses an audience in Harlow, England, in November 2019.
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From right, Labour leadership candidates Starmer, Lisa Nandy, Emily Thornberry, Jess Phillips and Rebecca Long-Bailey debate one another in Liverpool in January 2020.
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Starmer meets nurses during a visit to Addenbrooke's Hospital in Cambridge, England, in February 2020.
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Starmer attends a rally in London in February 2020. He would go on to be elected Labour leader, succeeding Corbyn.
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Starmer, front left, attends a hybrid Parliament session in London in April 2020.
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Starmer and his wife, Victoria, applaud essential workers outside their home in London in May 2020. This was during the first few months of the Covid-19 pandemic.
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Starmer speaks with nurses and midwives during a visit to the Whittington Hospital in London in March 2021.
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Starmer visits the Vulcan Boxing Club in Hull, England, during a campaign stop in April 2021.
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Starmer and London Mayor Sadiq Khan, right, visit the Evelyn Community Centre in London in May 2021.
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Starmer delivers the keynote speech during the Labour Party Conference in Brighton, England, in September 2021. It was his first in-person conference as Labour leader.
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Starmer, left, speaks with former British prime ministers Tony Blair, center, and Gordon Brown during the Accession Council ceremony in London where King Charles III was formally proclaimed monarch in September 2022.
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Starmer walks behind British Prime Minister Liz Truss during the ceremonial procession of the coffin of Queen Elizabeth II in September 2022.
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Starmer celebrates an England goal as he watches a World Cup match from London in November 2022.
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Starmer speaks at the House of Commons in December 2022.
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While visiting Scunthorpe, England, in April 2023, Starmer meets representatives from organizations that are dedicated to supporting victims of violence against women and girls.
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Starmer speaks to supporters in Chatham, England, in May 2023.
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A protester throws glitter over Starmer, disrupting his keynote speech at the Labour Party Conference in Liverpool in October 2023.
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Starmer travels with Rachel Reeves, shadow chancellor of the Exchequer, for a shadow cabinet meeting in April 2024.
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Starmer holds a card featuring six election pledges during a Labour event in Purfleet, England, in May 2024.
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Starmer campaigns in Gillingham, England, in May 2024.
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Starmer and his wife, Victoria, arrive at a polling station to vote in the general election in July 2024.
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Starmer speaks after winning the constituency of Holborn and St Pancras during the general election in July 2024.
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Starmer talks with King Charles III at Buckingham Palace after the election. The King invited Starmer to become prime minister and form a new government.
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Starmer and his wife, Victoria, greet Labour campaigners and activists at No. 10 Downing Street after the election.
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Starmer delivers his first speech as prime minister outside No. 10 Downing Street. "You have given us a clear mandate, and we will use it to deliver change, to restore service and respect to politics, end the era of noisy performance, tread more lightly on your lives, and unite our country," Starmer said.
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The Starmers wave from the steps of No. 10 Downing Street.

“He’s the first Labour leader in a generation to talk about class and snobbery,” Tom Baldwin, author of “Keir Starmer: The Biography,” told CNN. “This doesn’t make him a class warrior but someone who understands the different layers of pride, aspiration and guilt… He feels the sting of the disrespect his dad experienced… He talks a lot about his sister who has led a precarious life as a carer, having not gone to university.”

Starmer chose to study law at the University of Leeds, before completing a postgraduate degree at the University of Oxford. He initially thought he would have a legal career working for trade unions, but as his politics evolved in line with his studies, he became increasingly interested in human rights.

What does he believe?

Starmer has been on something of a journey since entering politics. He was elected to Parliament in 2015 at the age of 52 and entered the shadow cabinet a little over a year later.

Corbyn, then the Labour leader, made Starmer his Brexit chief following the 2016 referendum.

Corbyn is a controversial figure in British politics and serving in his top team is still something that haunts Starmer. Corbyn had historically been on the far left of the Labour Party. Prior to becoming leader in 2015, Corbyn had at various points in his long career supported nuclear disarmament, and withdrawal from NATO, and said it was a “tragedy” that Osama bin Laden was killed rather than put on trial.

Starmer was in Corbyn’s shadow cabinet for the 2017 and 2019 general elections – something the Conservatives bring up regularly as evidence that he is a threat to national security, having tried twice to make Corbyn prime minister.

However, Starmer has since kicked Corbyn out of the Labour Party following an investigation into antisemitism during Corbyn’s time as leader. Starmer has also said that he supported Corbyn knowing he would lose. Pressed on that point in a BBC “Question Time” program, he said Corbyn “would be a better prime minister” than “what we got” in Boris Johnson. Starmer also argues that he has brought Labour back to a position of electability.

This result proves that he was right, but critics of Starmer on the left say that he used Corbyn and his wing of the Labour Party to win the party leadership in 2020 – committing to several left-wing positions such as nationalizing public services, scrapping university tuition fees and reversing Conservative welfare reforms – only to abandon those pledges once he got closer to power.

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Starmer, left, and then-Labour leader Jeremy Corbyn talk to the media at the EU Commission headquarters on March 21, 2019 in Brussels, Belgium.

James Schneider, Corbyn’s former communications chief, told CNN: “Starmer is not a principled man. His campaign to become Labour leader was systemically dishonest. His cynicism and lack of policies to improve people’s lives will lead to a deep disillusionment that could either feed the hard right or a future people’s movement for change.”

Starmer has at various times responded to accusations that he has drifted politically by saying that he puts his country before his political party, and that it’s only possible to change things if you are in power.

Can Starmer change Britain?

Whether you think Starmer’s current plan is unambitious, dishonest, or exactly what Britain needs, it’s impossible to push through policy without political and personal capital.

Dominic Grieve, a Conservative politician who served as attorney general while Starmer was DPP, speaks glowingly of this period.

“He ran his department very efficiently and effectively at a really difficult time because his budget had been cut. It was genuinely very impressive,” Grieve told CNN.

Grieve added that Starmer was able to be an effective manager because “he is not bogged down with years of political ideology or baggage. He can see what is wrong and can address it.”

Much as Starmer’s allies might see this as a strength, his opponents, from both sides of politics, see it as a weakness.

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Starmer speaks while Director of Public Prosecutions, in 2010.

To those on the right, Starmer is a man who would say anything to get in power. He is someone who supported Corbyn – who is anti-NATO and has repeatedly been accused of being a terrorist sympathizer – to get what he wants and is a danger to Britain.

To the left, he is someone who doesn’t have the conviction to make radical changes and, once in office, will not be materially that different to a Conservative leader.

Starmer is now set to have an enormous majority in the House of Commons. But the future may not be so simple. Given the current state of Britain’s finances, the circumstances of Labour’s victory and, even Starmer’s own personality traits, it might mean he doesn’t have quite the blank check that a leader with virtually no opposition in parliament would typically enjoy.

An inability to turn that parliamentary power into tangible results at a time when voters are crying out for something different could mean that five years from now, his moderate, safety-first center-left program may ultimately be seen as just as big a political gamble as any of those the Conservatives took in the past 14 years.