Sir Olly Robbins, the UK's top Foreign Office civil servant, is leaving his post after the government discovered that his department failed to tell Prime Minister Keir Starmer that Lord Mandelson had failed security vetting before becoming US ambassador in February 2025. Starmer had repeatedly claimed to Parliament that Mandelson underwent and passed full vetting, raising questions about whether the PM knowingly misled Parliament or simply failed to ask essential questions about a major diplomatic appointment. The vetting failure, combined with Mandelson's later removal over Epstein connections, has prompted opposition parties to call for Starmer's resignation, with the SNP asking for a formal investigation into whether the PM deliberately lied.