For years, Morgan McSweeney operated as one of British politics’ most influential yet elusive figures. His voice was rarely heard in public, and he was known for sidestepping the glare of television cameras and photographers who haunt Whitehall during moments of crisis. But on February 8, 2026, McSweeney’s sudden resignation as Downing Street chief of staff—following the fallout from the controversial appointment of Lord Peter Mandelson as UK ambassador to Washington—sent shockwaves through the highest echelons of government, leaving Prime Minister Sir Keir Starmer’s leadership exposed and at a crossroads.
McSweeney’s exit was not just the story of a single adviser stepping down. According to BBC, his departure marked the loss of Starmer’s “political brain”—the strategist credited with masterminding Labour’s return to the political center and orchestrating its recent landslide general election victory. McSweeney’s influence over Starmer was so profound that, as many in Westminster quietly noted, it was McSweeney who chose Starmer, not the other way around. During the Corbyn years, McSweeney polled party members and concluded that Starmer, then a lawyer and shadow Brexit secretary, was Labour’s best hope for reclaiming control from the left. Through what some described as a “perfectly-executed deception,” he convinced pro-Corbyn members that Starmer was one of them, only for Starmer to later pivot sharply toward the center and purge many on the party’s left, including Jeremy Corbyn himself.
The immediate cause of McSweeney’s downfall was his advice in autumn 2024 to appoint Lord Mandelson as ambassador to the US—a move that quickly became radioactive. Mandelson’s ongoing friendship with convicted sex offender Jeffrey Epstein, and subsequent revelations that he may have passed sensitive information to Epstein, triggered a police investigation and a torrent of negative headlines. Mandelson was sacked in September 2025, but the issue was reignited when millions of documents—the so-called Epstein files—were released to the public, prompting renewed scrutiny and outrage.
In a statement following his resignation, McSweeney did not mince words: “The decision to appoint Peter Mandelson was wrong. He has damaged our party, our country and trust in politics itself. When asked, I advised the prime minister to make that appointment and I take full responsibility for that advice. In public life, responsibility must be owned when it matters most, not just when it is most convenient. In the circumstances, the only honourable course is to step aside.” (Sky News)
Starmer, for his part, responded swiftly and publicly. On February 6, he issued a direct apology to Epstein’s victims, saying, “I am sorry, sorry for what was done to you, sorry that so many people with power failed you. Sorry for having believed Mandelson’s lies and appointed him and sorry that even now you’re forced to watch this story unfold in public once again.” (Sky News)
The fallout from the Mandelson scandal and McSweeney’s resignation has not only rattled Starmer’s premiership but also prompted a rapid reshuffling at the heart of government. In a bid to steady the ship, Starmer turned to continuity rather than radical change, appointing McSweeney’s two deputies—Vidhya Alakeson and Jill Cuthbertson—as joint acting chiefs of staff. According to The Independent, both women bring extensive experience and deep Labour roots to their new roles, but their appointments have sparked debate within the party about whether this represents genuine renewal or simply more of the same.
Vidhya Alakeson, 49, has served as Labour’s director of external relations since 2022, forging ties with the business community and managing Downing Street’s external relationships. She previously worked as chief executive of Power to Change, a National Lottery-backed trust focused on strengthening communities through local business, and held influential roles at the Resolution Foundation and NHS England. Alakeson, who holds degrees from Oxford and the LSE and was awarded an OBE in 2021, has been described by insiders as both “the best of the best” and “completely incapable of making decisions and sticking to them”—a sign of the high expectations and scrutiny she now faces. (New Statesman)
Jill Cuthbertson, meanwhile, is a stalwart Labour aide with a reputation for political logistics and loyalty. She managed Starmer’s office from 2021 to 2024 and previously ran the political office of Gordon Brown, served as private secretary to Ed Miliband, and worked with Cherie Blair. Cuthbertson also played a significant role as events manager for the Britain Stronger in Europe campaign during the 2016 Brexit referendum. Known as the “ultimate gatekeeper” to Starmer, she is married to Mo Hussein, a former Conservative special adviser—a detail that has intrigued Westminster watchers. One insider told New Statesman, “No one can do high-stakes political logistics like Jill.”
The reaction within Labour to the appointments has been mixed. Some see Cuthbertson and Alakeson as “safe pairs of hands” capable of running Downing Street during turbulent times, while others view the decision as a missed opportunity to reset the narrative and signal change to the parliamentary party. “They’re both very talented, but what a waste,” lamented one minister. “This was a wasted last chance to properly reset the narrative with the PLP.” Another joked that the joint appointment reflected Starmer’s reluctance to make tough choices: “Do you want Vidhya or Jill? ‘Yes.’” (New Statesman)
The wider context for these changes is a government under siege. According to BBC, Labour MPs are closely watching Starmer’s next moves, with particular attention on the 37 Scottish Labour MPs who privately believe Starmer is a drag on their chances in the upcoming Holyrood elections. To mollify backbenchers and shore up support, the government launched a “charm offensive” starting with a reception at No 11 Downing Street on February 10, followed by a strategy meeting at No 10 the next day.
Despite the drama in Westminster, some Labour MPs doubt that voters outside the political bubble will notice or care about the resignation of a behind-the-scenes operator like McSweeney. “Talk of Mandelson very rarely came up on the doors in Gorton and Denton yesterday,” said one. Yet, as BBC noted, McSweeney’s exit removes Starmer’s most trusted adviser at a moment of isolation and potential peril for the prime minister.
Starmer has pledged that his government’s agenda—especially its focus on the cost of living—will remain unchanged. But with McSweeney gone, and with Cuthbertson and Alakeson now tasked with navigating a treacherous political landscape, the coming weeks may prove decisive for Starmer’s leadership and Labour’s fortunes. As Baroness Deborah Mattinson put it, the new acting chiefs are “both completely brilliant,” but the challenge ahead is formidable: restoring stability, rebuilding trust, and proving to a restless party and public that effective governance is still possible.
Only time will tell whether this moment marks a necessary reset or simply a holding pattern amid ongoing crisis. One thing is certain: the stakes for Starmer, his new chiefs of staff, and the Labour government could hardly be higher.