David Lammy has become the UK's new deputy prime minister following Angela Rayner's resignation.
Mr Lammy has also been named as justice secretary, moving from the foreign brief, as part of Prime Minister Keir Starmer's cabinet reshuffle.
Yvette Cooper will replace Mr Lammy as foreign secretary, while Shabana Mahmood will take Ms Cooper's place as home secretary.
Ms Rayner resigned following an investigation into her tax affairs.
Ms Rayner faced controversy in the UK over her tax affairs after admitting that she did not pay enough stamp duty when she bought a flat in Hove in East Sussex in May.
In a letter to Britain's Prime Minister Keir Starmer this morning, Ms Rayner said she "deeply regrets" her decision not to seek an additional specialist tax advice.
Mr Starmer responded to Ms Rayner saying she had "reached the right decision to resign, a decision I know is very painful".
She is the eighth, and the most senior, ministerial departure from Mr Starmer's team.
On Wednesday, Ms Rayner referred herself for an ethics investigation.
Ms Rayner, who is also the UK's housing secretary and the British Labour Party deputy leader, said she was incorrectly advised that she did not need to pay the higher stamp duty rate reserved for second home purchases.
She said she had not paid enough stamp duty on the purchase of the £800,000 (€900,000) flat.
She said she had initially been advised that she was not liable for the second property surcharge because she had sold her stake in her family home in Ashton-under-Lyne to a court-instructed trust established in 2020 to benefit her disabled son.
But she conceded she had made a "mistake" after fresh legal advice from a "leading tax counsel" later showed that she was liable for the extra duty on her new Hove flat.
Before then, she had insisted for weeks that she had paid the correct amount of tax.
Ministerial resignations wound Starmer
Losing eight cabinet and junior ministers, five of whom resigned over wrongdoing, means Mr Starmer has suffered the most ministerial resignations, outside government reshuffles, of any prime minister at the beginning of their tenure since at least 1979.
Mr Starmer has suffered even more departures than Boris Johnson, the next highest, whose administration was later embroiled in allegations of Covid lockdown-breaking parties.
Read more: Remarkable rise and fall of working class champion Rayner
It leaves Mr Starmer wounded as he prepares for a difficult end to the year, when his government must craft a budget that analysts and markets expect to contain further tax rises and try to contain the growing threat from Nigel Farage's Reform.
Returning from a summer break on Monday, Mr Starmer had hoped that a reshuffle in his Downing Street team would show he was ready to tackle the second half of the year with renewed vigour, bolstering his economic advice.
But that was quickly eclipsed by the allegations against Ms Rayner and by Mr Farage's accusation that Starmer was stifling free speech.
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