British Cabinet Office Releases Classified Epstein Files Detailing Former U.S. Ambassador Peter Mandelson’s Security Breaches

Cabinet Office reveals security breaches and severance rows involving former U.S. ambassador.

By: AXL Media

Published: Mar 11, 2026, 4:46 PM EDT

Source: The information in this article was sourced from UPI

Cabinet Office Disclosures Reveal Procedural Lapses in Diplomatic Vetting

The British government initiated a significant transparency measure on Wednesday by releasing a series of investigative files centered on Peter Mandelson, the former ambassador to the United States. These documents provide a detailed timeline of Mandelson’s brief and controversial tenure, highlighting a series of procedural irregularities that occurred immediately following his appointment in December 2024. According to the records, the Foreign, Commonwealth and Development Office engaged in a potentially serious security breach by offering to brief Mandelson on highly classified information while his mandatory vetting process was still active. This disclosure raises fundamental questions about the internal protocols governing high level diplomatic appointments and the rush to integrate Mandelson into the Washington circuit before formal clearance was secured.

Discrepancies in Security Timelines and Official Employment Offers

The released files illustrate a concerning gap between the commencement of sensitive diplomatic duties and the formalization of Mandelson’s security status. Correspondence dated December 23, 2024, shows that the ambassador was being handled as an active intelligence recipient just days after his public announcement. However, it was not until January 30, 2025, that Mandelson received official confirmation that he had successfully cleared the government’s vetting procedures. This five week window, during which Mandelson was granted access to state secrets without a completed background check, serves as a primary focus for the current Cabinet Office inquiry. The documents clarify that his formal offer of employment was only extended after this retrospective security approval, suggesting a "ready, fire, aim" approach to his high profile placement.

Market Sensitive Communications and the Epstein Connection

The impetus for this investigation remains Mandelson’s alleged proximity to the deceased sex trafficker Jeffrey Epstein. Mandelson was recently arrested and subsequently released in London under suspicion of misconduct in public office, a charge stemming from leaked emails within the broader Epstein files. In these communications, Mandelson appears to have shared market sensitive and confidential information with Epstein, potentially leveraging his public positi...