McSweeney quits as No 10 chief after Mandelson row
On Sunday 8 February 2026, Morgan McSweeney resigned as the prime minister’s chief of staff, saying he took “full responsibility” for advising Sir Keir Starmer to appoint Lord Peter Mandelson as UK ambassador to the United States in December 2024. Downing Street has named his deputies, Jill Cuthbertson and Vidhya Alakeson, as acting chiefs of staff. (theguardian.com)
If you’re catching up, here’s the cast of characters in one breath. McSweeney is the strategist credited with Labour’s 2024 win; Starmer is the prime minister now trying to steady No 10; Mandelson is a veteran Labour figure whose appointment to Washington was sold as experience, then unraveled. Mandelson was dismissed from the ambassadorship on 11 September 2025 after fresh emails about his links to Jeffrey Epstein came to light. (theguardian.com)
Why the anger now? Newly released Epstein files in the US suggest Mandelson maintained contact with Epstein after his 2008 conviction and, in some instances, shared or discussed sensitive information. One email trail indicates he tipped Epstein off that a huge eurozone rescue would be announced on the night of 9 May 2010; the package was unveiled hours later. UK police are separately probing whether confidential UK material was passed to Epstein years earlier. (news.sky.com)
McSweeney’s resignation doesn’t end the political argument. Some MPs say accountability should sit at the very top. The Conservative leader Kemi Badenoch said it was “about time”, adding that the prime minister must own his decisions, while the Fire Brigades Union’s general secretary, Steve Wright, became the first affiliated union leader to call for Starmer to go. Others urge patience, arguing Labour should hold together and fix the process. (theguardian.com)
Timeline to keep in your notes: 20 December 2024 - appointment announced; February 2025 - Mandelson takes up post in Washington; 11 September 2025 - dismissed as ambassador; 2–3 February 2026 - new US documents surface and the Met confirms a misconduct-in-public-office investigation; 6 February 2026 - police search two properties linked to Mandelson; 8 February 2026 - McSweeney resigns; 9 February 2026 - Starmer meets Labour MPs privately this evening. (gov.uk)
Vetting 101, so you can read the headlines with confidence. UK ambassadors require high-level national security clearance known as Developed Vetting (DV). But the Foreign Office has confirmed DV only began after Mandelson’s appointment was publicly announced, with earlier “due diligence” handled by the Cabinet Office’s propriety and ethics team. That sequencing - and who saw what, when - is now central to the row. (committees.parliament.uk)
What that vetting actually checks. DV goes far beyond a basic background check: it examines finances, past conduct, and personal relationships, alongside security interviews. Propriety and ethics checks are designed to surface reputational risks and conflicts before ministers make appointments. In short, these processes exist to protect national security and public trust - which is why any gaps matter. (instituteforgovernment.org.uk)
Where the police fit in. The Metropolitan Police are investigating possible misconduct in public office linked to the newly released documents; officers searched addresses in London and Wiltshire on 6 February. Mandelson has not been arrested or charged, and he disputes acting criminally or for financial gain. It will likely be months before investigators report back. (pbs.org)
One more constitutional thread you’ve asked us about. Mandelson has resigned from the House of Lords, but that does not remove his title. No 10 has asked officials to draft legislation to allow titles to be removed in serious cases; the Commons Library has set out how complex that would be. Translation: reform is possible but not quick. (itv.com)
Near-term politics. Expect questions on document disclosure around the appointment and vetting - BBC reporting suggests the government cache could approach 100,000 items - and pressure on whether Mandelson should return his reported pay-off after dismissal. Tonight’s Parliamentary Labour Party meeting is Starmer’s chance to calm MPs and set out a fix for vetting and appointments. (theguardian.com)
If you’re studying this in class or just trying to make sense of it, here’s the takeaway we’ll keep returning to. Big public jobs rely on two things: the judgment of leaders and the checks that test that judgment. When either slips, trust wobbles. As readers and citizens, we can track the facts, watch the timelines, and ask clear questions about process as well as people. We’ll keep updating this piece as new documents land and the police work continues. (theguardian.com)