New Mandelson papers to reveal Starmer’s appointment warnings and Epstein links

The real story in the Mandelson files was not just Peter Mandelson himself, but the machinery of government around him: who knew what, when warnings were shared, and how a sensitive appointment was shaped in private before it reached the public eye.

A House of Commons humble address on 4 February 2026 demanded the full paper trail on Mandelson’s appointment as ambassador to Washington, including due-diligence material sent to Number 10, conflict-of-interest forms, correspondence about his links to Jeffrey Epstein, communications between ministers and Mandelson, and any departure payments. The first tranche of papers was laid on 11 March 2026, and the second was expected to add a far larger picture of how Whitehall handled the case.

That first release already sharpened the political damage. It showed that Keir Starmer had been warned of a “general reputational risk” in appointing Mandelson because of his relationship with Epstein, and officials said the due-diligence material covered that relationship from at least 2002 to 2019. More than 300 documents had already been given to MPs, but the next batch was expected to be one of the largest disclosures to Parliament ever, described by ministers as the biggest publication since Chilcot and the second-biggest ever to Parliament after it.

The coming tranche was expected to include messages involving Mandelson and ministers and advisers, including Morgan McSweeney, Starmer’s former chief of staff. It could also shed light on how Downing Street handled a process that Jonathan Powell, the national security adviser, described as “weirdly rushed” and “unusual.” That kind of detail matters because it shows not only the outcome, but the internal tempo of decision-making, the pressure points, and where caution gave way to speed.

The government has said some records may be withheld or sent to the Intelligence and Security Committee of Parliament if they could prejudice national security or international relations. Starmer initially wanted exemptions on those grounds, but agreed that the committee would see confidential material. Officials have stressed that the disclosure exercise reaches across government and includes sensitive material that could not simply be dropped into the public domain without review.

The papers come against the backdrop of a Metropolitan Police investigation into alleged misconduct in public office, launched after Epstein-related material emerged. For Labour, the affair has become a test of Starmer’s judgment and of whether his government tried to narrow what would be disclosed before being forced to back down. The documents were set to expose not just a controversial appointment, but the culture of control and caution that shaped it.