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Top diplomat who stood in after Mandelson sacking abruptly leaves post

The Foreign Office gave no reason for the departure, while reports said he was questioned in a probe into leaked National Security Council discussions.

  • On Wednesday, Britain's deputy ambassador to the United States, James Roscoe, abruptly left his post, the Foreign Office confirmed. No official explanation was provided for the sudden exit of the senior diplomat based in Washington.
  • Roscoe previously served as Chargé d'Affaires between September 2025 and February 2026, assuming the interim role after Lord Peter Mandelson was sacked over his links to the late financier Jeffrey Epstein.
  • The Times reported that Roscoe faced questions regarding a probe into leaks of top-secret National Security Council discussions. Diplomats were reportedly gathered Wednesday to be informed of the reasons for his departure.
  • Staff at the British Embassy in Washington were told in a one-line email that the deputy head of mission was removed 'with immediate effect,' though the government offered no further details on the sudden move.
  • Before this Washington assignment, Roscoe worked as communications secretary to Queen Elizabeth II and served as a diplomat in Iraq, Sierra Leone, and at the United Nations, described by former colleagues as 'unflappable.
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He faced questions about how details of a secret meeting discussing Washington's request to use British military bases at the start of the Iran war were leaked to a journalist.

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GB News broke the news in London, United Kingdom on Tuesday, May 19, 2026.
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