This work investigates the evolution and influence of the Permanent Under-secretary for Foreign Affairs within the British government during a critical ninety-two-year period. Keith Neilson and T.G. Otte provide a detailed examination of the twelve individuals who occupied this senior civil service position between 1854 and 1946. By analyzing the administrative responsibilities and advisory roles of these officials, the authors argue that the office served as a vital, often overlooked, anchor for British foreign policy continuity amidst shifting political landscapes. The text utilizes extensive archival research and biographical data to map the intersection of bureaucratic power and international diplomacy.

Historians and political scientists recognize this volume as a definitive reference for understanding the mechanics of the British Foreign Office during the height of the Empire. Scholars frequently cite the work for its meticulous archival detail and its contribution to the study of administrative history in the nineteenth and twentieth centuries.