Lady Cynthia Colville, wife of the Hon. George Colville, younger son of the late Lord Colville of Culross pictured with her three sons, David, Phillip and Jock. Jock Colville served as Assistant Private Secretary to three Prime Ministers - Chamberlain, Churchill and Attlee. He was close to Churchill to whom he was also joint Principal Private Secretary and he kept a diary between 1939 and 1957 which chart his experiences close to the fulcrum of British political life. He served as Private Secretary to Princess Elizabeth (Queen Elizabeth II) from 1947 to 1949.