Former MI6 Chief Says Mandelson Risk Mitigation Was Impossible

Former MI6 chief Richard Dearlove said it would have been “totally impossible” to mitigate the risks raised by security vetting of Peter Mandelson’s foreign connections during Mandelson’s proposed appointment as the UK’s ambassador to the United States. Dearlove, who led the Secret Intelligence Service from 1999 to 2004, questioned how any safeguards could work for a role that routinely requires access to sensitive material.

The comments followed reports that government vetting officials recommended denying Mandelson developed vetting clearance in early 2025.

Security officials raised concerns about Mandelson’s associations with senior figures in China, Russia and Israel, according to the report. The government’s vetting agency, United Kingdom Security Vetting (UKSV), recommended that Mandelson be refused the clearance, but the Foreign Office granted it anyway. Former Foreign Office permanent secretary Olly Robbins has said “management actions” were put in place to mitigate the risks identified by officials.

Dearlove said he did not understand how such mitigations could be applied in practice. He suggested the only workable step would be to restrict what documents the ambassador could see, but argued that this would not be compatible with an ambassadorial job. “What mitigations could you put in place?” Dearlove said, adding that blocking an ambassador from viewing papers circulated within the Washington embassy “would be totally impossible.”

The report said UKSV flagged Mandelson’s links to China’s Minister of Finance Lan Fo’an, Russian oligarch Oleg Deripaska and former Israeli military intelligence general Tamir Hayman. It also cited concerns about a very close relationship with a fourth individual, who is British, that officials believed could be compromising.

Vetting concerns and Foreign Office decision

According to the report, another issue identified by UKSV was a £1 million loan Mandelson received to invest in an Israeli startup. The report said the Foreign Office granted clearance within hours of UKSV recommending it be denied.

Robbins has described the case as “borderline,” a characterisation disputed by critics who say the reported concerns appear more substantial than that. Robbins had not responded to requests for comment about the basis for his “borderline” claim, according to the report.

Parliamentary scrutiny and document release

The controversy has drawn parliamentary scrutiny. A motion known as a humble address has been passed ordering the publication of papers relating to Mandelson’s appointment, with the government due to publish a tranche of documents next month.

However, concerns remain that some documents may be redacted or withheld. The intelligence and security committee has publicly accused the government of withholding some vetting documents and implementing redactions “far too broadly,” the report said, and MPs criticised the Cabinet Office’s handling of the process during a parliamentary debate.

The next test will be whether the forthcoming release satisfies Parliament’s demand for full disclosure and whether any further scrutiny follows once documents are published.