Margaret Barbara Lambert "was quite literally born into politics," The Independent noted, as the daughter of Viscount Lambert, Member of Parliament and Civil Lord of the Admiralty, and Barbara Savers. Following the end of World War I, Margaret accompanied her father on a tour of the war cemeteries in Belgium and northern France, leaving her with an indelible memory of the region and the tragedy of war. She never married. After working for the BBC in Europe during World War II, Miss Lambert became a lecturer in modern history at the University of St. Andrews. Along with her teaching, in 1946, she was named editor of the British diplomatic documents on foreign policy and, with her excellent spoken German, served for 30 years as editor-in-chief of the captured German documents. Her published works included The Saar (1934). With Enid Marx, her lifelong friend, she co-wrote When Victoria Began to Reign (1937), English Popular Art (1952), and English Popular and Traditional Art (1946).