McSweeney WhatsApp Vanish Hits Mandelson Files 2026

Key Points

• Morgan McSweeney, the Prime Minister’s former chief of staff, is believed to have had auto-delete features enabled on some WhatsApp chats, causing messages to vanish permanently from both sender and recipient devices.
• This raises concerns over potential gaps in the “Mandelson Files,” documents related to Peter Mandelson’s appointment as US ambassador, amid scrutiny of Mandelson’s ties to Jeffrey Epstein.
• McSweeney’s government phone was stolen on October 20, 2025, with contents wiped as a security measure, occurring four months before Parliament ordered the release of the Mandelson Files.
• Officials are attempting to recover exchanges, but many are believed lost forever, despite guidance for aides to copy government business onto official systems.
• Tory shadow cabinet minister Alex Burghart demands full disclosure, including backups, and questions the extent of the Mandelson-Epstein scandal.
• The government is launching a review of ministers’ and aides’ phone and WhatsApp use, confirmed by Cabinet Office minister Nick Thomas-Symonds.
• Sir Keir Starmer has dismissed claims of a faked phone theft as “far fetched.”
• A government spokesman affirms commitment to publishing the Mandelson Files while supporting the Metropolitan Police investigation.
• Downing Street faces turmoil over these revelations, with fears that full No10 discussions on Mandelson’s Epstein links may never surface.

London (Britain Today News) – March 28, 2026 – Revelations that Morgan McSweeney, the Prime Minister’s former chief of staff, had vanishing messages enabled on some WhatsApp chats have intensified scrutiny over the so-called Mandelson Files, as the Government prepares to publish documents linked to Peter Mandelson’s controversial appointment as US ambassador.

The disclosures, understood by The Sun on Sunday, highlight widespread use of auto-delete functions among No10 aides and ministers, potentially erasing chats involving Mandelson that could prove embarrassing.

What Are the Mandelson Files and Why Do They Matter?

The Mandelson Files refer to a trove of documents and communications surrounding Peter Mandelson’s nomination and discussions for the role of UK ambassador to the United States. Parliament ordered their release amid growing concerns over Mandelson’s past associations, particularly his links to the late US financier and convicted paedophile Jeffrey Epstein.

As reported by journalists at The Sun on Sunday, these files are central to understanding internal Government deliberations. The fresh blow stems from fears that key exchanges may be irretrievable due to digital practices within Downing Street.

Tory shadow cabinet minister Alex Burghart commented sharply on the issue. As quoted by The Sun on Sunday, Burghart stated:

“Thanks to Morgan McSweeney’s disappearing phone with its disappearing messages, we may never know the full extent of the Mandelson-Epstein scandal. But there should be a backup of the messages – and if there isn’t, Labour must tell us why. But Labour must release all relevant information they hold about this sorry affair, and do so as soon as possible.”

This statement underscores Opposition demands for transparency, framing the episode as a potential cover-up.

How Did Morgan McSweeney’s Phone Theft Unfold?

Downing Street was plunged into turmoil following The Sun on Sunday’s revelation last week that Mr McSweeney’s government phone was stolen on October 20, 2025. Its contents were automatically wiped as a standard security measure, erasing most messages exchanged with the shamed Mandelson.

Crucially, the theft occurred four months before Parliament mandated the release of the Mandelson Files, though discussions about them were already underway at the time, according to sources cited by The Sun on Sunday.

Sir Keir Starmer has directly addressed conspiracy theories. As reported by The Sun on Sunday, Sir Keir slammed claims that the phone theft could have been faked as “far fetched.” Officials have since scrambled to recover at least some exchanges, but many are believed lost forever.

Government guidance stipulates that aides should copy official business onto secure systems. However, the prevalence of auto-delete WhatsApp features – which cause messages to vanish permanently on both the sender’s and recipient’s phones – complicates recovery efforts.

Why Are Disappearing WhatsApp Messages Causing Alarm?

Today’s revelation, as exclusively understood by The Sun on Sunday, sparks fresh concerns that comprehensive No10 discussions about Mandelson’s ties with Jeffrey Epstein may never come to light. Epstein, a notorious figure convicted of sex trafficking, died in 2019 while awaiting trial on federal charges.

The auto-delete functionality is not unique to McSweeney; The Sun on Sunday understands he is among many No10 aides and ministers who employ it. These messages then vanish forever, potentially including sensitive chats with and about Peter Mandelson.

This practice has drawn parallels to broader issues exposed in the Covid Inquiry, where disappearing messages raised red flags over accountability.

What Is the Government Doing About Phone and WhatsApp Use?

In response to the mounting controversy, The Sun on Sunday can reveal that the Government is launching a formal review of how ministers and aides use their phones and WhatsApp.

Cabinet Office minister Nick Thomas-Symonds confirmed this in a written parliamentary question. As quoted by The Sun on Sunday, he said:

“The current guidance was issued under the previous government. We plan to review the way that non-corporate communication channels are used in Government and to update the accompanying guidance to reflect the changes in the ways we use technology.”

It is understood this review was already in progress before the Mandelson controversy erupted, prompted by Covid Inquiry concerns over ephemeral messaging.

A government spokesman provided further reassurance. As reported by The Sun on Sunday, the spokesman said they are committed to publishing the Mandelson Files

“while continuing to support the Metropolitan Police with their investigation.”

He added:

“All government departments, ministers and relevant individuals are being asked to provide all relevant information they hold.”

This multi-pronged approach aims to address systemic issues while advancing the specific Mandelson probe.

Who Is Morgan McSweeney and What Is His Role in This?

Morgan McSweeney served as Sir Keir Starmer’s chief of staff, a pivotal position in No10 operations. His stolen phone and use of vanishing messages place him at the epicentre of the scandal, as detailed extensively by The Sun on Sunday.

Previously, The Sun on Sunday linked McSweeney’s device to broader security lapses, including reports on his stolen phone revealing insights into Starmer’s Britain.

Peter Mandelson, a Labour grandee, faces renewed scrutiny over his Epstein connections, which have tainted his ambassadorial bid.

What Happens Next for the Mandelson Files Publication?

The Government’s commitment to release the files remains firm, with active cooperation extended to the Metropolitan Police. However, the vanishing messages and wiped phone contents cast doubt on the completeness of disclosures.

Alex Burghart’s call for backups and full transparency echoes wider political pressure. Failure to produce comprehensive records could fuel accusations of obfuscation.

Broader Implications for Government Transparency?

This saga highlights vulnerabilities in modern governance, where instant messaging tools outpace official protocols. The impending review could lead to stricter rules, mandating preservation of digital communications.

Neutral observers note that while security wipes are standard post-theft, the timing and auto-delete prevalence invite legitimate questions. Labour insists all recoverable material will surface, but sceptics like Burghart demand proof.

As the Mandelson Files loom, this episode tests Downing Street’s credibility amid ongoing Epstein-related inquiries. Full publication, expected soon, will determine if gaps persist or if backups fill the voids.