Peter Mandelson’s private WhatsApp messages, released this week as part of the second tranche of documents related to his short-lived appointment as UK ambassador to Washington, paint a bleak picture of Number 10 in mid‑2025. The exchanges, chiefly with Pat McFadden, then chancellor of the duchy of Lancaster, and other senior figures, describe a Downing Street that Mandelson saw as “beleaguered and bereft” and in urgent need of “a complete revamp and infusion of purpose.”
A blunt assessment of the No 10 team
In a July 2025 message to McFadden, Mandelson wrote that after visiting No 10 he found the operation lacking direction and confidence. His words were stark: “It is beleaguered and bereft. It requires complete revamp and infusion of purpose and confidence to get anywhere.” He went further on staffing, arguing that the team around Keir Starmer was not properly led and that many staff did not know what the prime minister wanted, or that “Keir knows what he wants.”
‘Be more Trumpian’ — advice steeped in urgency
The files reveal Mandelson urging a more combative, attention‑grabbing approach. In messages after the local elections in 2025 — where Reform made significant gains — he told McFadden that Starmer’s operation needed “panache, verve” and, controversially, suggested a “more Trumpian risk‑taking and dare‑devil way.” That advice, laced with the language of theatrical politics, underlines Mandelson’s view that Labour lacked the aggressive style required to shake up public perception and seize the agenda.
Internal strains and policy tensions
The documents also chronicle internal tensions over policy and messaging. In the week the government backed down over changes to winter fuel payments, McFadden warned Mandelson that the climbdown “doesn’t feel good for Keir” and predicted the welfare retreat would “destroy his authority.” Other messages show MPs and ministers debating taxation and spending priorities, and questioning whether the party’s approach was connecting with voters beyond the Whitehall and party bases.
Political fallout and resignations
Mandelson’s blunt assessments and the wider Epstein revelations that later engulfed him had very real political consequences. He was sacked as ambassador in September 2025 after further disclosures about his relationship with Jeffrey Epstein. The scandal precipitated his resignation from the Lords and a government commitment to strip his peerage; Starmer accused Mandelson of betrayal and lying to Downing Street about the depth of his ties to Epstein. The controversy also triggered senior exits from the prime minister’s office, including the resignation of chief of staff Morgan McSweeney, and it has fed unrest among Labour MPs about Starmer’s leadership.
Security vetting and procedural failures
Newly published material also highlights procedural failings around the appointment itself. Former permanent secretary Olly Robbins was sacked after reports suggested Mandelson had not satisfactorily completed UK Security Vetting before starting as ambassador. Robbins later accused Number 10 of a “dismissive approach” to vetting — a claim that compounds wider concerns about how the appointment was handled and how standards were applied.
Broader implications for Labour
The Mandelson files do more than detail personal communications: they offer a window into the strategic anxieties within Labour at a time when the party was wrestling with how to present itself post‑election and respond to populist surges. Calls from within for more theatre and risk‑taking reflect a deeper question about how Starmer’s leadership balances sober competence with the kind of charisma and narrative momentum that persuades undecided voters.
Cost and transparency
The publication of the second tranche has been costly: the Cabinet Office reportedly spent over £1m disclosing these documents. The material, numbering more than 1,000 pages, also includes messages to the then‑foreign secretary David Lammy, with Mandelson telling Lammy in November 2024 that he would “never regret” appointing him ambassador — a starkly self‑assured statement that now sits alongside the other revelations.
What the files reveal about party culture
Beyond strategy and appointments, the messages reveal a culture of blunt, at times impatient counsel from Mandelson to senior figures — an old hand pushing for dramatic change. His language about the need to “break out of the Whitehall system and mould” and appear “less like business as usual” signals a frustration with bureaucratic caution and a yearning for political theatre. Whether that posture would have been electorally effective is another matter; it crystallises a debate within Labour: between managerial competence and bold, attention‑grabbing leadership.
The Mandelson tranche will continue to be parsed for weeks — not only for the sensational personal fallout but for what it discloses about the strategic debates and internal tensions that have shaped Labour’s direction in government. The exchanges lay bare the pressure points around leadership, messaging, and the management of political appointments — and they illustrate how private counsel, once public, can reshape the narrative around a government’s competence and cohesion.