Who is James Roscoe? Britain’s Deputy Ambassador to US abruptly leaves post in Washington

James Roscoe, one of Britain’s most senior diplomats in the United States, has stepped down from his position as deputy head of mission at the British Embassy in the US capital.Officials at the Foreign Office confirmed Roscoe had “left his post” but did not provide any further details regarding his departure, BBC reported.Roscoe also served as Charge d’ Affaires to the US between September 2025 and February 2026, temporarily leading the embassy during a key period in UK-US diplomatic relations.Before moving to Washington, Roscoe represented the UK at the United Nations General Assembly and later held senior communications roles within the UK government, including positions at the Cabinet Office and the Department for Exiting the European Union.He is also known for serving as communications secretary to Elizabeth II between 2013 and 2016.Earlier in his career, Roscoe worked inside 10 Downing Street as chief press officer for former UK prime ministers Tony Blair and Gordon Brown.During his time in Washington, Roscoe played a role in major diplomatic events, including arrangements linked to former US president Donald Trump’s state visit to the UK and Charles III’s recent visit to the United States.His earlier diplomatic assignments also included postings connected to the United Nations, Sierra Leone and Iraq.