What happens during security vetting and why did Peter Mandelson fail his?

"The vetting process is not carried out by the Foreign Office. It is done by security officials who work for United Kingdom Security Vetting (UKSV)."

"Weeks later, in late January 2025, UKSV concluded that Mandelson should not receive DV, but the Foreign Office decided he could receive that security clearance."

"Some details are published by the government about the process. Applicants have to complete questionnaires on their use of the internet, their finances and any security considerations."

"Perhaps the most intense and intrusive section of the process is an hours-long interview with a security vetting officer, who will discuss a range of matters with the applicant."

Keir Starmer appointed Peter Mandelson as ambassador to the US, initiating a security vetting process through UK Security Vetting (UKSV). Mandelson required developed vetting (DV) for access to top secret material. Although UKSV concluded he should not receive DV, the Foreign Office allowed him to obtain the necessary clearance. The reasons for his failure in the vetting process remain undisclosed. The vetting includes extensive questionnaires and interviews covering personal and financial matters, but details of individual results are not publicly shared.

Read at www.theguardian.com