In the momentous period -- barely 30 years -- covered by this systematic reference/guide, the Edwardian world was transformed unrecognisably, through war, technological progress and social change, into the Nuclear Age. It saw the coming of mass democracy, the apogee of empire, the Depression, the threat of fascism, the development of suburban society, and, as yet scarcely understood, the end of Britain''s international hegemony. Andrew Thorpe''s superb contribution to the Companions series illuminates all this and much else. It will be indispensable to anyone interested in the history and politics of modern Britain.