Andy Burnham walked up Downing Street on Monday evening without a lectern, without a teleprompter, and spoke plainly into a single microphone — a small break from tradition that seemed to signal a larger one. Just over three hours later, the former mayor of Greater Manchester had reshaped the top of British government, sacking a swathe of Sir Keir Starmer's most loyal ministers and installing at the Treasury a man who, only weeks earlier, had walked away from the cabinet in protest over money.

Burnham, 56, became the United Kingdom's 59th prime minister on Monday 20 July after being formally appointed by King Charles III at Buckingham Palace. He is the seventh person to occupy Number 10 in little more than a decade — a statistic he will be acutely aware of, and one he has said he intends to bring to an end. In his first address as prime minister, he described the moment as "a circuit breaker for Britain," promising "a new political model and a new economic model" and an economy in which "we put life's essentials back under stronger public control to make them affordable again."

The most eye-catching decision of the evening was his choice of chancellor. John Healey, the former defence secretary, was handed the keys to the Treasury in a move that caught Westminster off guard. For days, speculation had centred on Home Secretary Shabana Mahmood and Energy Secretary Ed Miliband as the frontrunners for the second most powerful job in government. Instead, it went to a 66-year-old who resigned from the Ministry of Defence only weeks ago after failing to secure the defence funding he wanted — a rise to 3% of GDP by 2030 from just over 2% now, a gap running to tens of billions of pounds.

That resignation, many in Westminster now believe, was the beginning of the end for Starmer. Healey's departure exposed the fault lines in the previous government's spending plans and emboldened the wave of MPs who ultimately forced the former prime minister from office. His promotion to the Treasury, as Sky's chief political correspondent Jon Craig observed, invites an obvious question: is it a reward for the man whose exit helped bring down his predecessor?

Whatever the motivation, the appointment carries a clear message about Burnham's priorities. Healey used his first interview as chancellor to pledge that Britain "will meet our commitments on defence to our international allies," while stressing that "fiscal control is the first duty of any chancellor." He had spoken, he said, to the prime minister about the need to "work in lockstep to meet the fiscal rules," and to the governor of the Bank of England, Andrew Bailey, about making "life more affordable for working people." Twenty years since he last served as a Treasury minister under Gordon Brown, Healey joked that the chancellor's office was "very much as Gordon Brown left it."

The tension embedded in his brief is stark. As Sky's economics and data editor Ed Conway put it, an incoming chancellor committed to greater military spending "would mean a significant shift in terms of the UK government's priorities in future years" — and raises the unavoidable question of where the money comes from, whether through more borrowing, cuts to other departments, or higher taxes. Military chiefs, for their part, are likely to welcome the arrival of an ally in charge of the nation's finances. Even Kemi Badenoch, the Conservative leader, offered qualified congratulations, saying Healey "can now ensure the Defence Investment Plan is properly funded."

The other great offices of state were filled with a mix of continuity and elevation. Mahmood, widely tipped for the Treasury herself, instead stayed at the Home Office, having made clear to Burnham that she wished to remain and "finish the job" on immigration and policing reform. "I may be biased," she said, "but it's the best job in the business." Miliband, meanwhile, secured a considerable promotion, moving from energy to the Foreign Office — the same post held by his brother David between 2007 and 2010. Visibly moved, he called it "the honour of my life," recalling that his parents "came here as Jewish refugees fleeing from the Nazis" and pledging to carry "their spirit" into the role. The move also required him to relinquish his net-zero brief, an area on which he and Burnham are understood to disagree.

If the promotions told one story, the departures told another. Over the course of the evening, ten former cabinet ministers — most of them close allies of Starmer — announced they were returning to the backbenches. Among them were some of the biggest names of the previous administration: chancellor Rachel Reeves, the country's first female chancellor; deputy prime minister David Lammy; business secretary Peter Kyle; housing secretary Steve Reed; and science and technology secretary Liz Kendall. Hilary Benn left the Northern Ireland Office, calling it "a great privilege" to have served, while Jenny Chapman departed as international development minister, saying she was "disappointed" but wished the new prime minister "every success."

Reeves's exit appears to have been the sharpest of the night. She is understood to have declined an alternative senior cabinet role and chosen to leave government altogether — a decision that Sky's deputy political editor Sam Coates suggested may have thrown a "hitch" into Burnham's carefully guarded plans. At one point during the evening, Coates counted 14 people inside Number 10, a crush of ministers and allies awaiting news of their fate as rumours swirled that entire departments — including science and technology — might be abolished or reshaped. "It is getting rather late," he noted, "and no resolution."

The reshuffle also marked the rehabilitation of two figures who had left government under a cloud. Angela Rayner returned as housing secretary, the very role she was forced to relinquish in September last year after being found to have breached the ministerial code over her tax affairs; her brief again covers devolution, a cause central to Burnham's political identity. Louise Haigh, who resigned as transport secretary in November 2024 following a Sky News investigation into a historic offence, returned to cabinet as chancellor of the Duchy of Lancaster and a Cabinet Office minister — a role former deputy Labour leader Harriet Harman described, alongside her Treasury title, as amounting to "deputy prime minister in all but name."

Elsewhere, Yvette Cooper moved from the Foreign Office to health, tasked with continuing efforts to cut NHS waiting lists and reform social care; Pat McFadden retained work and pensions, having impressed Burnham with plans to tackle youth unemployment; Jonathan Reynolds returned to business and trade in an expanded, renamed department; and Lucy Powell, Labour's deputy leader, was promoted to education, a move that demoted Bridget Phillipson to minister for women and equalities alone. Anneliese Midgley, elected only in 2024, was rewarded for running Burnham's Makerfield by-election campaign with the post of chief whip.

The geography of those appointments did not go unnoticed. Coates pointed out that a striking proportion of the early arrivals at Number 10 — Reynolds, Powell, Nandy, Rayner and Burnham himself — hail from Greater Manchester or its surrounds. "If that's not a faction, I don't know what is," he said, describing "the northern powerhouse" now installed at the heart of Whitehall. It is a charge that sits awkwardly against Burnham's pledge, made only days ago at the TUC, to end Labour's tradition of factionalism. Some allies of Miliband, Coates noted, had privately worried that too many northern MPs "would be seen too much like a factional takeover." For the mayors Burnham leaves behind, however, the mood was jubilant. "It's a great day to be a mayor," said Tracy Brabin, the Labour mayor of West Yorkshire, hailing an "opportunity to rebalance the economy."

One conspicuous absence hung over the day. Wes Streeting, the former health secretary who resigned in May to challenge Starmer for the leadership before falling in behind Burnham, was nowhere to be seen for much of the evening, appearing neither in Westminster nor on social media. His late arrival at Number 10 — after the chancellorship and his old health brief had both been filled — did little to clarify his future, and left open questions about what, if any, deal had secured his support.

Beyond the reshuffle, Burnham spent his first hours in office on the telephone to world leaders, setting out an agenda that leaned heavily on both his domestic vision and foreign affairs. He reaffirmed "resolute commitment" to Ukraine in a call with President Volodymyr Zelenskyy, who thanked "Andy" and "Britain" for their steadfast support. He agreed with the European Commission president, Ursula von der Leyen, to work towards a UK-EU summit later this year, and discussed Ukraine, energy and the loan of the Bayeux Tapestry with France's Emmanuel Macron. In a notably warmer exchange than his history with the US president might have suggested, Burnham congratulated Donald Trump on a successful World Cup, invited him to Manchester, and discussed securing shipping through the Strait of Hormuz. Trump, who once dismissed Burnham as "the mayor of a town," has more recently praised him over the prospect of expanded North Sea drilling.

That question of oil and gas is one of several policy tests looming over the new government. Powell has indicated Burnham will honour the previous administration's commitment on existing North Sea licences, though reports suggest the prime minister is now "open-minded" on new drilling — a potential shift from the 2024 manifesto. On his first full day in office, Burnham has promised to announce measures to help with the cost of living, offering what he called immediate support for households alongside longer-term change. He is also expected to scrap Starmer's planned nationwide digital ID scheme, redirecting resources — the Office for Budget Responsibility had put the programme's cost at £1.8bn over three years, a figure Downing Street disputed — towards easing household bills.

The scale of the challenge is considerable. UK GDP is projected to grow by just 0.8% this year, and the prospect of a more left-leaning prime minister has already unsettled bond markets that had drawn comfort from the fiscal caution of Starmer and Reeves. Lord David Blunkett, the former education secretary named by Burnham as a mentor, said the new prime minister was "stamping his authority" and had a blunt message for his top team: "Your job's on the line. Either you deliver now… or you'll be out."

Burnham's rise has been swift and, in its final stages, almost procedural. After Labour's heavy losses in May's local, Senedd and Scottish elections, more than 95 of the party's MPs called on Starmer to go. Burnham, then still mayor of Greater Manchester and without a Commons seat, was handed a route back to Parliament when the Makerfield MP Josh Simons resigned to allow him to contest the by-election, which he won on 18 June. Starmer announced his intention to resign on 22 June, and by 17 July Burnham had secured the nominations of 379 of Labour's roughly 403 MPs — some 94%, the highest share ever recorded in a modern Labour leadership contest — making the outcome a formality.

For Starmer, the end came with characteristic understatement. "My work is done," the outgoing prime minister said, describing his time in office as "the privilege of my life" and insisting he was leaving Britain "stronger and fairer." For Burnham, the work is only beginning. The qualities that made him a formidable metro mayor — a talent for picking fights, claiming credit and speaking for a single region — do not always translate to the trade-offs and collective responsibility of national government. As Sky's political editor Beth Rigby reflected at the close of a whirlwind day, the seventh prime minister in a decade will be hoping, above all, to stop the revolving door of Downing Street spinning once again.