Ministers are accused of hiding key information on Peter Mandelson as crucial file on his vetting to stay secret

By REBECCA CAMBER, CRIME AND SECURITY EDITOR Published: 21:08, 31 May 2026 | Updated: 21:10, 31 May 2026 Ministers have been accused of hiding key information on Peter Mandelson as it emerged that a crucial file on his vetting will not be published. The Cabinet Office will no longer release a summary document on the peer's security vetting ahead of his appointment as Britain's ambassador to the US after Scotland Yard advised that doing so could jeopardise any future prosecution. The nine-page document compiled by the UK Security Vetting (UKSV) agency was set to be included in the second tranche of Mandelson files expected to be released as early as this week. Last month it emerged that the vetting agency, part of the Cabinet Office, recommended Mandelson's vetting be denied. It is thought the UKSV was concerned about his associations, including in China. Alex Burghart, Shadow Chancellor of the Duchy of Lancaster, said: 'The stench of scandal will continue to hang around Keir Starmer's Government until he is honest about who knew and when. The Cabinet Office briefed that the UKSV summary document would be published – it should honour that commitment.' Last week senior ministers were accused of attempting to hide their messages with Mandelson. Officials reportedly had to ask for them multiple times before they were submitted by members of the Cabinet. The Cabinet Office will not release a summary document on Peter Mandelson's security vetting ahead of his appointment as Britain's ambassador to the US (Mandelson is pictured in London on May 14, 2026) And the Intelligence and Security Committee, tasked with reviewing the Government's redactions on national security grounds ahead of the documents' release, said redactions on non-security grounds were 'being applied far too broadly'. Any failures by Mandelson to declare a possible conflict of interest in the vetting process could constitute misconduct in public office. A government spokesman said: 'We are committed to complying with the Humble Address [that forced the released of documents] in full. The second tranche of documents will be among the largest publications ever laid in Parliament.' No comments have so far been submitted. Why not be the first to send us your thoughts, or debate this issue live on our message boards. By posting your comment you agree to our house rules. Do you want to automatically post your MailOnline comments to your Facebook Timeline? Your comment will be posted to MailOnline as usual. Do you want to automatically post your MailOnline comments to your Facebook Timeline? Your comment will be posted to MailOnline as usual We will automatically post your comment and a link to the news story to your Facebook timeline at the same time it is posted on MailOnline. To do this we will link your MailOnline account with your Facebook account. We’ll ask you to confirm this for your first post to Facebook. You can choose on each post whether you would like it to be posted to Facebook. Your details from Facebook will be used to provide you with tailored content, marketing and ads in line with our Privacy Policy.