A British diplomat who briefly held the title of interim ambassador after Peter Mandelson’s unceremonious exit has now made his own graceful exit, leaving the Washington embassy one deputy head of mission lighter.

In a statement that would make a cryptic crossword puzzle proud, a Foreign Office spokesman said only: “James Roscoe has left his post.” No further explanation was offered Tuesday night for the departure of Roscoe, who had served as deputy head of mission at the British embassy since 2022. The silence was deafening, and possibly diplomatic.

Roscoe was among the names floated for the top job after Mandelson was shown the door over his unfortunate ties to convicted paedophile financier Jeffrey Epstein. That gig ultimately went to Christian Turner, leaving Roscoe to serve as charge d’affaires to the US - a role that apparently involved a lot of state visits. He played a key part in Donald Trump’s state visit to the UK in September 2025 and, more recently, helped coordinate King Charles’s US state visit for the 250th anniversary of American independence. Busy guy.

Before his Washington adventure, Roscoe was the UK ambassador to the UN and served as communications chief to the late Queen Elizabeth II. He also spent time as chief press officer in Downing Street for prime ministers Tony Blair and Gordon Brown, which is a bit like saying he survived two separate administrations without a scandal. His earlier diplomatic postings included the UN, Sierra Leone, and Iraq - a résumé that suggests he’s seen a thing or two.

Why he left remains a mystery wrapped in a diplomatic pouch. Perhaps he found a better offer. Perhaps he simply had enough of the embassy snack selection. The Foreign Office isn’t saying, and we’re left to speculate.