Sir Keir Starmer is facing renewed political turbulence after fresh messages from the latest tranche of the so-called Mandelson files reportedly alleged deep divisions and plotting within the upper ranks of the Labour Party.
Private communications attributed to Lord Peter Mandelson and senior figures close to the Prime Minister are said to raise concerns about internal manoeuvring involving Angela Rayner and former Prime Minister Gordon Brown, with suggestions of efforts to undermine the leadership from within Labour’s own ranks.
In the exchanges, Lord Mandelson is reported to have described Ms Rayner as an “instrument of destabilisation” and warned that Mr Brown “has it in for Keir and Rachel big time”, referring to the Prime Minister and Chancellor Rachel Reeves.
The messages, which are understood to have been exchanged with No10 aide Pat McFadden, also claim growing frustration within Labour’s parliamentary ranks, with references to a “mutinous” Parliamentary Labour Party and concerns that the Government was not “leading from the front”.
The disclosures, which form part of a wider release of documents relating to Lord Mandelson’s tenure as UK ambassador to the United States, are likely to deepen unease within No. 10 at a sensitive political moment for the Government.
The Conservative Party seized on the reports, portraying them as evidence of instability at the heart of Labour’s leadership. Party figures compared the language in the messages to past disputes over Labour’s economic credibility and internal discipline.
Lord Mandelson, who was removed from his Washington posting after further questions were raised over his historic association with convicted sex offender Jeffrey Epstein, has consistently denied wrongdoing in relation to his conduct in office.
The latest material is understood to have been released following parliamentary pressure under a “humble address”, a rarely used mechanism compelling the Government to disclose documents.
The Mandelson affair has already placed significant strain on Downing Street, with critics alleging a lack of transparency around his appointment and subsequent dismissal. Several senior officials have reportedly left their posts amid the fallout from the wider release of the document.
Among those referenced in the files are Gordon Brown, who has recently been appointed as a special envoy on global finance, and Angela Rayner, who remains a central figure in Labour’s internal power structure.
In the messages, Mr Brown is alleged to have been viewed as a destabilising influence within the wider Labour ecosystem, with claims that he was positioning himself and allies to exert pressure on the Prime Minister’s authority.
At the time of his appointment, Mr Brown was tasked with developing international financial partnerships linked to defence and security investment, as part of a broader effort to strengthen UK economic ties abroad.
The Government has insisted that redactions applied to the Mandelson files were necessary on national security grounds and to avoid prejudicing ongoing investigations. Officials say further documents will be released in due course.
Downing Street has not commented on the specific contents of the alleged messages, but has previously rejected suggestions of internal disunity at the top of Government.
However, the emergence of further claims is likely to fuel speculation about factional tensions within Labour at a time when the Prime Minister is attempting to project stability and control following a difficult electoral and economic backdrop.
With more files expected to be published in the coming months, senior figures in Government are bracing for further disclosures that could deepen political pressure on No10 and reignite questions about the internal cohesion of Starmer’s administration.
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