Parliamentary Dispute Over Peter Mandelson’s Vetting Files

On 19 May 2026 the Intelligence and Security Committee (ISC) accused the government of over-redacting and withholding documents concerning Peter Mandelson’s security vetting for his appointment as UK ambassador to the United States. Chief Secretary to the Prime Minister Darren Jones defended the redactions as necessary to protect personal data and national security, and announced that the remaining material will be laid before the House after the Whitsun recess on 1 June.

The Guardian

A humble address passed by the Commons obliges the government to supply documents to the ISC, which then decides what may be withheld on national-security grounds. The upcoming release is billed as the largest government publication since the Chilcot Inquiry.

The Guardian

• 12:51 BST – Government says more than 300 documents have been referred to the ISC.

The Guardian

• 13:06 BST – ISC deputy chair Jeremy Wright warns the government cannot unilaterally alter the humble address.

The Guardian

• 13:20 BST – Shadow minister Neil O’Brien calls the redactions “an extremely serious matter.”

The Guardian

• 13:36 BST – Darren Jones rejects the cover-up claim, stating he would resign if one existed.

The Guardian

• Over 300 documents have been sent to the ISC for vetting.

The Guardian

• The publication will be “one of the largest government publications ever laid in this house,” second only to the Chilcot Inquiry.

The Guardian

Jones argued that redactions follow Freedom of Information rules, the ministerial code and Commons resolutions, protecting junior officials’ names and contact details. He maintained that raw interview data “would never be published because … it would undermine the very basis of our national security system.” The government also said a review of non-corporate communication channels is under way.

The Guardian

Jeremy Wright and Neil O’Brien asserted that the government exceeded the humble address’s scope, effectively withholding material. Labour MPs Emily Thornberry and Kim Johnson expressed disappointment, accusing the government of a “cover-up” of “dodgy dealings.” Richard Burgon pressed for assurance that senior staff held appropriate clearances.

The Guardian

The government confirms the ISC has received advisory documents and the Foreign Office’s decision, yet it withholds the “raw data” from interviews, citing national-security concerns. The ISC claims the redactions are excessive, leaving a factual gap about which specific information remains undisclosed.

The Guardian

• “He went on: double quotation mark But we cannot accept that the government is entitled to ignore or to unilaterally alter the terms of the humble address.” — Jeremy Wright, Conservative deputy chair, ISC

The Guardian

• “If the government was engaged in a cover-up, he would resign, he said.” — Darren Jones, Chief Secretary to the PM

The Guardian

• “29 BST Emily Thornberry, the Labour chair of the foreign affairs committee, said she was “disappointed” with Jones’ response to the concerns expressed by the ISC.” — Emily Thornberry, Labour chair, Foreign Affairs Committee

The Guardian

The vetted files will be laid before the Commons on 1 June, after which further parliamentary scrutiny of the redaction process is expected.

The Guardian