UK Ambassador to Japan: Will She Testify in the Mandelson Inquiry? (2026)

The UK's next ambassador to Japan, Corin Robertson, finds herself at the center of a political storm, with potential implications for her upcoming appointment. The controversy revolves around her involvement in the decision to grant Peter Mandelson security clearance, despite the advice of vetting officials. This decision has sparked a parliamentary inquiry, with Robertson's potential testimony raising questions about the transparency and integrity of the process.

Robertson, as the Foreign Office's (FCDO) chief operating officer, played a pivotal role in late January 2025 when she participated in the decision to grant Mandelson clearance. What makes this case intriguing is the lack of written records or audit trails, which has left MPs struggling to piece together the events. This absence of documentation has led to a reliance on recollections and verbal briefings, raising concerns about the accuracy and reliability of the information.

The decision to grant Mandelson clearance was made by Olly Robbins, the FCDO's most senior civil servant, who was later sacked by Keir Starmer for failing to inform him about the vetting process. Robbins' decision was made despite the recommendation of the vetting agency to deny clearance. This revelation has sparked a heated debate, with Starmer expressing his fury over the situation, labeling Robbins' actions as 'unforgivable'.

One of the key questions surrounding this controversy is the extent of Robertson's involvement and knowledge. Did she review the contents of Mandelson's vetting file, or did she rely solely on oral briefings? The fact that she is the only official among the three top civil servants involved in the decision yet to be questioned by parliament adds to the air of suspicion. Her potential testimony could provide crucial insights into the decision-making process and help resolve the unanswered questions surrounding the case.

The controversy also highlights the broader issue of the security clearance process and the potential for political interference. The UKSV's recommendation to deny clearance due to 'high' concerns about Mandelson, and the subsequent overruling by Robbins, raises questions about the independence of the vetting process. The fact that Robbins and Collard claimed the case was 'borderline' without providing any publicly released evidence further adds to the mystery.

The ongoing parliamentary inquiry, particularly the Foreign Affairs Select Committee's investigation into Mandelson's appointment as ambassador to the US, is expected to delve deeper into these issues. The release of further documents under the humble address system will be crucial in providing a more comprehensive understanding of the events. However, there are concerns that the files may be incomplete or censored, which could hinder the committee's ability to uncover the full truth.

In conclusion, the case of Corin Robertson and the Peter Mandelson security clearance controversy serves as a stark reminder of the delicate balance between political appointments and the integrity of the civil service. The potential testimony of Robertson and the ongoing parliamentary inquiry will play a crucial role in shedding light on the decision-making process and ensuring accountability. As the investigation unfolds, the public awaits the release of the documents, hoping for a transparent and fair resolution to this complex affair.

UK Ambassador to Japan: Will She Testify in the Mandelson Inquiry? (2026)
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