London (CNN) — Britain’s Deputy Prime Minister Angela Rayner has resigned following a scandal over her failure to pay the correct amount of property tax, adding to the woes of the country’s struggling centre-left government.

Rayner’s departure is another headache for the United Kingdom’s increasingly unpopular leader, Keir Starmer, and deprives his Cabinet of one of its brightest political stars.

In a letter addressed to Starmer on Friday, Rayner said that she was stepping down as Britain’s Deputy Prime Minister and Housing Minister, as well as Deputy Leader of the Labour Party.

Despite securing a landslide election victory in July 2024, Labour is now facing a rising challenge from the upstart anti-immigration Reform UK party, which currently leads national opinion polls and is holding a national conference in Birmingham on Friday.

Her resignation pushed UK Prime Minister Keir Starmer to undertake a significant reshuffle of his Cabinet later on Friday.

David Lammy, who had been serving as the UK’s Foreign Secretary, was appointed as Rayner’s replacement as well as Justice Secretary, according to Downing Street.

Yvette Cooper, who had been serving as Home Secretary, has taken up Lammy’s former role as Foreign Secretary, Downing Street said. Meanwhile, Shabana Mahmood, who had previously held the role of Justice Secretary, has become the new Home Secretary.

Rayner had been fighting for her political survival after it emerged that she had not paid enough property tax on an apartment in Hove on England’s southern coast, which she bought earlier this year.

Rayner claimed her mistake was unwitting and based on poor legal advice. Yet opposition parties and right-wing British tabloids quickly labelled her a hypocrite, due to her history of mauling Conservative ministers in the previous government over similar “sleazy” incidents. Her actions soon snowballed into a national scandal.

Starmer initially stood up for his deputy, but his support grew weaker by the day. Defending Rayner became ever more challenging, given that Britain is wracked by a housing crisis and that Labour is considering raising taxes, including on property. Critics said her position had become untenable.

In her letter on Friday, Rayner wrote that media scrutiny had made staying in her post “unbearable”, writing: “While I rightly expect proper scrutiny on me and my life, my family did not choose to have their private lives interrogated and exposed so publicly.”

Rayner’s resignation has cost Labour one of its most talented politicians, whose forthright style, working-class roots and strong northern English accent helped bridge divisions within the Parliamentary Labour Party.

Rayner grew up poor on the outskirts of Manchester and became a mother at 16. Before entering politics, she trained as a carer for older people and worked as a trade union representative. Her earthy, extroverted manner contrasts with the more reserved, standoffish Starmer, a former human rights lawyer.

“For a teenage mum from a council estate in Stockport to serve at the highest level of government has been the honour of my life,” Rayner wrote on Friday. “I’ve always known that politics changes lives because it changed mine.”

Used to politicians who are overly polished and often educated at expensive private schools, young Labour voters have delighted in Rayner’s “realness”. She has been filmed dancing at a London Pride march and partying in a DJ booth in Ibiza. Recently, she was pictured vaping while in an inflatable canoe off the beach in Brighton.

But Rayner’s apartment near that beach became the flashpoint for the scandal. When Rayner bought the property in neighbouring Hove for £800,000 (nearly $1.1 million) in May this year, she said she had been advised that she did not need to pay the tax – known as stamp duty – which is higher on second homes. Rather than paying the higher rate, which would have amounted to £70,000 ($94,000), she paid £30,000 ($40,000).

Rayner said she did so because she had already sold her stake in her Greater Manchester constituency home and placed it into a trust for her children. That trust was funded from a medical award after her son was left with lifelong disabilities after he was born prematurely.

Some tax experts voiced modest sympathy for Rayner, given how complicated the UK tax system is.

“The tax system is a mess, stamp duty particularly messy, and the higher rate for additional properties beyond messy,” Dan Neidle, the founder of Tax Policy Associates, wrote on X. “So, I’m generally forgiving of people who make mistakes.”

But Neidle conceded that Rayner had made her position more difficult given how, during Labour’s years in opposition, she often hounded Conservative politicians over their own tax affairs.

In 2018 she accused then Health Secretary Jeremy Hunt of “sleaze” for using a “Tory tax loophole” to save nearly £100,000 in stamp duty when buying seven apartments. She also called for the resignation of Nadhim Zahawi, the former Chancellor, after he confirmed he paid nearly £5 million ($6.7 million) to authorities to settle his tax affairs.

Although some analysts have suggested Starmer may quietly be pleased with the resignation of his main rival and potential successor, the toppling of Rayner caps off what has been a dreadful summer for Labour, in which the party has lost more ground in the polls to the insurgent Reform UK.

In a letter written to Rayner on Friday, Starmer said he was “very sad” that her time in his government had “ended in this way.”

“Although I believe you have reached the right decision, it was a decision which I know is very painful for you,” he wrote, adding that she has been a “trusted colleague and true friend for many years.”