By tradition, the British Royal Court is still officially resident at St. James's Palace, which means that, while foreign ambassadors assuming their new position are received by the British sovereign at Buckingham Palace, they are accredited to the "Court of St. James's Palace". This anomaly continues for the sake of tradition as Buckingham Palace is to all intents and purposes the official residence. See History of St James's Palace (Official website of the British Monarchy).
