Peter Mandelson Ambassador Scandal: Unanswered Questions Persist

The parliamentary inquiry into Peter Mandelson’s appointment as U.S. ambassador has amassed more than 77,000 words of testimony from five senior government officials and advisers. As the Foreign Affairs Select Committee meets this week to chart next steps, concerns persist that key questions remain unresolved.

The investigation has been hindered by a lack of documentary evidence amid fears the government is not complying with a parliamentary motion that ordered the release of “all papers” related to the appointment.

A committee source said MPs plan to meet Tuesday, with options ranging from drafting preliminary conclusions to extending the inquiry to demand more answers from the Foreign Office.

The deliberations come at a pivotal moment for Prime Minister Keir Starmer. His decision in December 2024 to appoint Mandelson has overshadowed his premiership and prompted repeated calls for his resignation. One of Starmer’s potential Labour leadership rivals, former Health Secretary Wes Streeting, who resigned last week, also faces questions about his proximity to Mandelson. Streeting has previously stated he was never a close friend of Mandelson.

Concerns have been raised that any conclusions by the committee at this stage may be premature. The next batch of Mandelson-related files due under the parliamentary motion—known as a humble address—is not expected until June.

Several unanswered questions remain, particularly concerning evidence from Olly Robbins, the former permanent secretary at the Foreign Office who granted Mandelson clearance and was later dismissed by Starmer.

The committee has focused on a decision Robbins made over a few hours in late January 2025.

Weeks earlier, Starmer had announced Mandelson as his choice for ambassador. Robbins and others testified that pressure from Downing Street existed to expedite Mandelson’s arrival in Washington, with his security vetting considered a formality.

Like nearly all Foreign Office staff, including junior civil servants, Mandelson required “developed vetting” security clearance. The risk assessment was conducted by UK Security Vetting (UKSV), an agency within the Cabinet Office, but the final decision rested with the Foreign Office.

After interviewing Mandelson twice and scrutinizing his background, UKSV officials completed their assessment on January 28. A summary document detailing their findings and conclusions reached the Foreign Office via a “secure portal” the next day at 1:52 p.m.

UKSV assessed Mandelson as a “high” overall concern and recommended denial of clearance. However, within hours, the Foreign Office decided—against that advice—to grant clearance with mitigations.

A source on the Foreign Affairs Select Committee said the lack of transparency over Mandelson’s vetting impeded MPs’ ability to scrutinize Robbins’ decision. Committee members have not been told why UKSV considered Mandelson a national security risk or what mitigations were implemented.

It remains unclear whether the next batch of documents from the humble address will provide answers. On Friday, the Intelligence and Security Committee—a parliamentary group reviewing the most sensitive Mandelson documents before their release under the humble address—criticized the government for withholding Mandelson’s vetting file and applying redactions “far too broadly.”

Robbins, as permanent secretary—the most senior civil servant in the Foreign Office—bore ultimate responsibility for granting Mandelson clearance. In his testimony, Robbins defended that decision but admitted to MPs he did not read a UKSV document summarizing Mandelson’s vetting file.

Instead of requesting the approximately 10-page document, Robbins said he relied on an oral briefing about its contents from his security chief, Ian Collard, a career diplomat.

Collard did not testify, but a letter submitted to the committee on his behalf by the Foreign Office revealed he also did not read the UKSV summary document. He, too, relied on an oral briefing from an unnamed official on his team.

The Foreign Office letter disclosed the involvement of a third official: the department’s then chief operating officer, Corin Robertson. It said Collard discussed UKSV’s findings with Robertson, who agreed that “the risks could be mitigated” and advised Collard to take Mandelson’s case to Robbins for a final decision.

The committee is now considering whether to invite Robertson, who will become the UK’s ambassador to Japan in August, to give evidence.

Pressed on why he did not review the short UKSV summary document, Robbins said such files are highly sensitive and must remain in a “hermetically sealed box.”

Robbins stated it would require a “wholly exceptional circumstance” for him to examine any such file. Committee Chair Emily Thornberry asked: “This is a wholly exceptional circumstance, surely?” Robbins replied: “No.”

The Guardian understands the document was marked “official – sensitive,” a routine government classification well below “secret” or “top secret” files with restricted access.

When Cabinet Office Permanent Secretary Cat Little testified before the same committee, she said “anyone within the security chain” can request such information “if they feel it is necessary.”

Another point of confusion from Robbins’ testimony was his widely reported claim that Mandelson’s case was less than straightforward.

Robbins told the committee he was informed that UKSV “considered Mandelson a borderline case” and was only “leaning towards” recommending denial of clearance.

Committee members found this claim puzzling. The agency’s conclusions were marked in two red boxes on the summary file, with ticks indicating Mandelson posed a “high” overall concern, leading to a recommendation of “clearance denied.”

A template of the document, published by the Cabinet Office, shows UKSV had an “amber” option for clearance approved with “risk management” but chose the more severe “clearance denied.”

MPs on the committee, reportedly briefed by the Cabinet Office on the summary document, questioned Robbins repeatedly on this point.

No documents published since his testimony support the “borderline” claim. No witnesses who testified—other than Collard—have used that word.

Starmer, who has seen the summary document, did not reference a “borderline” case when updating the House of Commons about UKSV’s findings. Little, who also saw the document, did not mention it in her committee testimony.

Despite insisting in his testimony that it would have been wrong for him to review Mandelson’s vetting file summary when granting clearance, Robbins told MPs he asked to see the file seven months later.

Mandelson was withdrawn from the Washington embassy on Sept. 11, 2025, after revelations about his relationship with sex offender Jeffrey Epstein.

Robbins said that around this time, queries were made on his behalf about whether he could see the document. The Cabinet Office deemed he should not see it because he lacked a national security justification, he told MPs.

Collard also requested to see the summary document around the same time. Neither official has been asked to explain why they wanted to see Mandelson’s UKSV document after he lost his job.

The document was emailed to Collard’s team, according to Little, four days after Mandelson was sacked.

What happened next is one of the key mysteries the committee may now seek to resolve. The Foreign Office stated that when Collard reviewed the document in mid-September 2025, the security chief took notes as an “aide memoire.”

He noted the tick boxes—“high concern” and “clearance denied.” But the letter added: “He also noted that, as well as the tick boxes, UKSV stated in the final case assessment: ‘Overall, I believe that this is a very borderline case.’”

The committee may now seek clarification on that sentence. When Collard noted the reference to “a very borderline case,” was he referring to official UKSV paperwork he was viewing for the first time? If so, why have no other officials or ministers referenced such a UKSV document when briefing parliament?

Alternatively, could Collard have produced in September 2025 a record of something he claims to have been told seven months earlier? So who exactly told Collard the case was “very borderline,” and when?

The Guardian posed those questions to the Foreign Office and Robbins. Neither provided any answers.