Exclusive: Officials have spent weeks debating whether or not to release highly sensitive information about the affair

Keir Starmer was left in the dark about sensitive information relating to Peter Mandelson’s security vetting by two other top civil servants, including the head of the civil service, the Guardian can reveal.

The prime minister said on Friday that it was “unforgivable” and “staggering” that senior officials did not tell him that Mandelson failed a security vetting process weeks before he took up his role as ambassador to Washington.

Exclusive: Adrian Fulford, who chaired the recent Southport inquiry, will also examine the wider national security vetting system

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A retired high court judge is expected to review Peter Mandelson’s vetting process and the wider national security vetting system.

The review, commissioned by Downing Street, comes after a Guardian investigation revealing that security officials decided Mandelson should not receive developed vetting clearance, but were overruled by the Foreign Office to allow him to become US ambassador.

Keir Starmer understood to have lost confidence in official over decision to override security vetting failure

• Mandelson failed vetting but Foreign Office overruled decision

Sir Olly Robbins, the UK Foreign Office’s top civil servant, has been forced out of his post after the decision to fail Peter Mandelson during his security vetting was overruled by his department.

Robbins was the Foreign Office’s most senior official in late January 2025 when the decision was made, paving the way for Mandelson to become the US ambassador.

Exclusive: Opinions split on ‘unprecedented’ release of files, despite demand for ‘all papers’ related to ex-US ambassador’s appointment

• Revealed: Mandelson failed vetting but Foreign Office overruled decision

• Five key questions: who overruled decision to deny Mandelson security clearance?

Senior government officials have been considering whether to withhold from parliament sensitive documents that show Peter Mandelson failed security vetting before he assumed the role of US ambassador, the Guardian can reveal.

Any such decision could amount to an extraordinary breach of a parliamentary vote that ordered the release of “all papers” relevant to Mandelson’s appointment.