Cabinet Office minister Nick Thomas-Symonds is speaking after the government released more than 1,500 pages of documents linked to Lord Mandelson’s appointment as ambassador to the US, which include private messages critical of Prime Minister Keir Starmer and other ministers. The files, published on 1 June 2025, contain WhatsApp exchanges and emails in which figures including Peter Mandelson and then-Cabinet Office colleagues express scepticism about No 10’s direction and Labour backbench views on welfare. Work and Pensions Secretary Pat McFadden’s May 2025 remark that many Labour meetings ask “who can we tax in order to pay benefits to others” has drawn sharp attention. Thomas-Symonds defended the release as part of an open, independent process and said ministers remain focused on delivering policy.
Key takeaways
- The government published roughly 1,504 pages of correspondence on 1 June 2025 relating to Lord Mandelson’s appointment as UK ambassador to the US, including WhatsApp messages and emails.
- Pat McFadden, now Work and Pensions Secretary, wrote in May 2025 that many Labour meetings ask “who can we tax in order to pay benefits to others,” a line that has prompted criticism from opposition and some Labour MPs.
- Nick Thomas-Symonds told the BBC the published files contain “embarrassing” private messages but said their release shows government transparency and that redactions were overseen independently.
- Thomas-Symonds cited recent policy outcomes — including an 80% fall the government reported in net migration and faster reductions in NHS waiting lists — as evidence of the effect of No 10 changes introduced in September 2024.
- Lord Mandelson did not hand over messages from his personal device, and some documents remain withheld either at the request of the Metropolitan Police (investigating alleged misconduct in public office) or for national security reasons.
- Conservative and some Labour figures have complained about extensive redactions and missing material; questions remain about whether items were withheld, redacted for security, or genuinely absent.
Background
Peter Mandelson was appointed UK ambassador to the United States in December 2024 and was dismissed nine months later after new reporting about his links to Jeffrey Epstein. In February 2025 MPs voted to compel release of documents relating to the appointment; the government published the latest tranche on 1 June 2025. The package runs to more than 1,500 pages and includes WhatsApp messages, emails and other correspondence involving senior figures across government and political circles.
The documents provide a snapshot of private communications inside government, revealing frustration and blunt assessments of colleagues and processes. Some material has been redacted for reasons the government says include national security and an ongoing Metropolitan Police inquiry. Lord Mandelson has declined to hand over messages from his personal device and has denied wrongdoing; the police have asked for certain files to be withheld while they investigate potential misconduct in public office.
Main event
On 1 June 2025 the government released the Mandelson files, prompting immediate scrutiny in Westminster and the media. Among the most politically sensitive disclosures were messages in which Mandelson described No 10 as “beleaguered and bereft” and said Keir Starmer “lacks verve,” and an exchange in which Pat McFadden criticised the framing of welfare debates within the party. The publication followed a House of Commons vote requiring the release of documents tied to Mandelson’s appointment.
Nick Thomas-Symonds appeared on BBC programming to set out the government’s position. He emphasised that the redaction and release process had been reviewed by the Parliamentary intelligence committee, insisting there had been “no ministerial interference” and that redactions were handled at arm’s length. He also described the publication as evidence of transparency, while acknowledging that private messages now made public may be embarrassing for those involved.
Thomas-Symonds was also asked about the theft of his personal phone in 2025 and a separate theft affecting a former No 10 chief of staff; he described his own phone theft as a “horrible experience” and said the coincidence of another theft could not be commented on beyond calling it a coincidence. Separately, opposition figures and some Labour backbenchers highlighted the volume of redactions and alleged gaps in the released record.
Analysis & implications
The Mandelson files underline how contemporary political management increasingly operates through instant messaging and email, creating contemporaneous records that can emerge later with political consequences. Private, off-the-cuff exchanges can now shape public narratives and feed media cycles, raising questions about how ministers and advisers discuss sensitive personnel and policy judgments in written form.
Politically, the disclosures have potential to erode public confidence in collective government discipline and reinforce opposition narratives of internal division. The most immediate risk is reputational: selective excerpts can be amplified by opponents and the press, shaping perceptions even where context or fuller documents remain redacted. For Prime Minister Keir Starmer, who has already faced strains to authority after recent electoral setbacks, the leaks add another pressure point to internal party management.
From a governance perspective, the episode may drive stricter guidance on record-keeping and the use of personal devices for political business. It could also encourage wider adoption of secure channels or formal policies to minimise informal written records on matters that touch security or personnel vetting. Finally, the withheld materials tied to the Metropolitan Police inquiry mean that substantive legal or disciplinary consequences could follow, though timing and scope remain uncertain.
Comparison & data
| Item | Reported figure / note |
|---|---|
| Pages released | 1,504 pages across multiple files |
| Net migration | Reported by minister as down 80% since the September 2024 No 10 changes |
| Redactions and withheld material | Portions withheld at police request or for national security; extent not fully disclosed |
The figures in the released material and ministers’ public claims should be treated separately: the government cites an 80% reduction in net migration as an outcome linked to internal restructuring introduced in September 2024. The files themselves are a different dataset — a record of conversations rather than statistical evidence — and many passages are heavily redacted, limiting the ability to draw definitive conclusions about intent or decision-making from any single excerpt.
Reactions & quotes
Conservative critics seized on McFadden’s private remark about welfare to challenge Labour’s messaging and policy intent, arguing the comment undermined Labour’s public position. Labour backbenchers also expressed concern, saying the language used in private exchanges was at odds with ministers’ public explanations.
“I don’t agree with that view about the prime minister.”
Nick Thomas-Symonds, Cabinet Office minister
Thomas-Symonds used his interviews to defend the prime minister and the policy direction that followed the September 2024 reshuffle, pointing to departmental outcomes the government says demonstrate progress. He stressed that redactions were examined independently and that private messages becoming public was a consequence of the parliamentary process.
“There is a lot of stuff that is missing… acres and acres of white space.”
Alex Burghart, Conservative MP (shadow cabinet minister)
Opposition MPs argued the published files are incomplete and warned that missing material may leave an incomplete picture. They suggested either documents were withheld for political reasons or that material is absent for other explanations such as police requests.
“His comments are quite extreme on welfare… I find it a bit alarming.”
Kim Johnson, Labour MP
Some Labour figures publicly distanced themselves from McFadden’s private phrasing while noting that his departmental priorities emphasise opportunity and employment, not punitive measures.
Unconfirmed
- Whether specific missing passages were deleted from original devices or merely withheld as redactions has not been established publicly.
- The motives behind timing or sequencing of particular leaks and the full contents of Mandelson’s withheld vetting file remain the subject of further inquiry and are not yet public.
Bottom line
The publication of the Mandelson files has produced politically charged excerpts that feed both opposition attack lines and internal party concern. While individual messages have attracted headlines, the broader context is a complex mix of candid private exchanges, formal vetting records and legally sensitive material — some of which remains redacted or withheld for police or security reasons.
For ministers and officials, the immediate challenge is managing reputational fallout while continuing to deliver policy; for Parliament and the public, the episode raises questions about how informal written records are kept and released. The story is likely to evolve as further material is clarified, as the Intelligence and Security Committee examines withheld vetting files and as the Metropolitan Police investigation progresses.