Downing Street releases Mandelson ambassador files

Downing Street is set to release hundreds of documents about Peter Mandelson’s appointment as the UK’s ambassador to the United States, after MPs ordered disclosure of files on how the former Labour minister was vetted. The first tranche, expected on Wednesday, includes a short Cabinet Office due diligence report warning of “reputational risk” linked to Mandelson’s relationship with the late financier Jeffrey Epstein, according to The Guardian.

The release follows parliamentary pressure for transparency around an appointment that became politically toxic. Mandelson, 72, resigned from the Labour party and the House of Lords in February after the release of Epstein-related files in the US, and The Guardian reports he was sacked from the Washington role last September. He has denied wrongdoing.

The documents are being published under a framework agreed with the Metropolitan police to avoid prejudicing an ongoing investigation. Mandelson was arrested last month on suspicion of misconduct in public office over allegations he leaked confidential information to Epstein while serving as business secretary under Gordon Brown, and was later released from bail conditions while remaining under investigation, The Guardian reports.

The mechanics of the disclosure matter as much as the content. A staged release—“hundreds” now, with “tens of thousands” to follow—lets the government control tempo and framing: enough material to satisfy MPs and headlines, but filtered through process and policing constraints. The first batch is also expected to contain information already in the public domain, including press reports about Mandelson’s links to Epstein, which limits the immediate evidentiary shock while still meeting the formal requirement to disclose.

The due diligence note itself, described as two pages, points to how modern appointments are managed: not as a question of whether a candidate can do the job, but whether the political cost can be contained. The Guardian reports that officials warned Prime Minister Keir Starmer that proceeding in December 2024 carried serious reputational risk, and that Starmer’s response—asking his then chief of staff Morgan McSweeney, described as a friend of Mandelson, to seek an explanation—may be scrutinised as inadequate.

Diplomatic posts are among the few high-status roles a government can grant without a general election, and the fight over the paperwork shows why vetting has become a battlefield. When an appointment is defended as routine and then treated as a security-sensitive disclosure exercise, the public learns less about foreign policy than about how the state insures itself against embarrassment.

A statement on the release is expected from Darren Jones, the chief secretary to the Treasury, after prime minister’s questions on Wednesday, The Guardian reports.

The government will publish documents about how it chose a US ambassador while the police investigate whether that ambassadorial candidate should have been chosen at all.