The Law That Let Sir Olly Robbins Stay Silent Why the Mandelson Vetting Decision Was Legally His Alone to Make

Under the Constitutional Reform and Governance Act 2010, national security vetting operates independently of ministers meaning Robbins may have been legally correct not to tell Starmer, even as the Prime Minister insists the withholding was indefensible.

At the heart of the Mandelson vetting scandal lies a question that has received far less scrutiny than the political fallout: was Sir Olly Robbins legally permitted to tell the Prime Minister that Lord Mandelson had failed his security vetting or was he, in fact, legally barred from doing so?

The answer, according to the Constitutional Reform and Governance Act 2010, is deeply uncomfortable for both sides.

What the Law Actually Says

Section 3 of the Constitutional Reform and Governance Act 2010 assigns the power to manage the civil service to the Minister for the Civil Service a role held by convention by the Prime Minister. However, the Act also explicitly states that management powers over both the home civil service and the diplomatic service do not cover national security vetting. Vetting sits outside the ordinary management power entirely. A diplomatic appointment and a vetting decision are, in law, legally distinct things.

Official vetting guidance likewise treats national security vetting as a separate process from the appointment itself, with final decisions on difficult vetting questions and any waiver process ordinarily resting at permanent secretary level strongly implying that Sir Olly Robbins, as Permanent Secretary at the Foreign, Commonwealth and Development Office, held the authority to authorise Mandelson's clearance. 

What Robbins and Cooper Previously Told MPs

The legal architecture underpinning Robbins' position was not new information. A letter sent jointly by Robbins and then-Foreign Secretary Yvette Cooper to the Foreign Affairs Select Committee on 16 September 2025 stated that "the vetting process is also independent of ministers who are not informed of any findings other than the final outcome." 

That letter now sits at the centre of the dispute. It suggests Robbins was not acting unilaterally or secretively he was operating within a framework he had already disclosed to Parliament, months before the scandal became public.

Robbins' Defence and the PM's Rebuttal

Appearing before the Foreign Affairs Committee on Tuesday, Robbins rejected the suggestion that No 10's desire to appoint Mandelson overrode security concerns. He told MPs he would not have appointed Mandelson if he had known vetting had been formally denied. He also said he did not see the formal written recommendation that Mandelson should not be given clearance only receiving a verbal briefing from his department's security team that the appointment was a "borderline" case, and that UKSV believed the risks could be mitigated. 

Robbins' allies have insisted that under the Constitutional Reform and Governance Act, national security vetting is legally independent of ministers, and that the senior civil servant was therefore unable to alert the Prime Minister or ministers due to internal processes. 

Starmer has pushed back firmly on that reading. According to the BBC source document, the Prime Minister told the House of Commons that "there is no law that stops civil servants sensibly flagging UKSV recommendations, while protecting detailed sensitive vetting information to allow ministers to make judgements on appointments." The government has also published legal advice this week suggesting it would have been permissible to pass on the UKSV recommendation.

The Procedural Gap at the Core of This Crisis

The process as outlined by Robbins in his September letter to the Foreign Affairs Committee requires that the permanent secretary alone bear responsibility for overturning the findings of the security vetting procedure with ministers informed only of the final outcome, not the underlying recommendation. This is potentially the true constitutional scandal of the affair: not deliberate concealment, but a legal framework that allowed an elected Prime Minister to be kept in the dark about a significant security risk by design. 

Civil servants at the Foreign Office were able to override security warnings by deploying a rarely used, high-level authority to grant clearance despite a recommendation to deny it, reportedly on the understanding that the Prime Minister wanted the appointment to proceed. 

Other Stories-

-BBC Proms 2026: Full Programme, Tickets & Last Night Details

-London Tube Strike 2026: When Will the Underground Resume Normal Service?

-Tube Strike Today: London Underground Disruption, Affected Lines & Dates

What Comes Next

Starmer has announced that the Foreign Office will lose its power to overrule vetting recommendations for diplomats, according to LBC. He has also appointed Sir Adrian Fulford a senior judge and chair of the Southport Inquiry to lead an updated review of government security vetting, with expanded terms of reference to cover how all decisions are made in relation to national security vetting, as reported by the BBC.

Whether that reform is sufficient and whether the existing legal framework exonerates Robbins or merely explains him is a question Parliament has not yet resolved.