Volume III deals with the 'long twentieth century'. Its main themes are:
* the contraction of British industrial power and the shift to a service-based economy
* the decline of Victorianism and the rise of Modernism
* the climax of class society between the wars and the blurring of class lines after the 1960s
* the impact of two world wars
* the decline of British power and the empire
* the partition of Ireland
* the devolution of power to Wales and Scotland.

part I|213 pages

The Decline of Victorian Britain 1870–1914

chapter Chapter 1|20 pages

Troubles in Economy and Society, 1870–1914

chapter Chapter 2|20 pages

Crisis of Confidence, 1870–1914

chapter Chapter 3|17 pages

Revival on the “Celtic Fringe”

chapter Chapter 4|23 pages

Politics and the State, 1867–1914

part II|107 pages

An Age of Total War 1914–1945

chapter Chapter 6|24 pages

The Great War, 1914–1918

chapter Chapter 9|22 pages

Politics, Power, and the Coming of War, 1919–1939

chapter Chapter 10|21 pages

Britain and World War II

part III|108 pages

Britain in the Postwar World 1945–2000

chapter Chapter 11|23 pages

Welfare, Affluence, and Consensus, 1945–1970

chapter Chapter 14|23 pages

Thatcher’s Britain, 1970–1990

chapter Chapter 15|14 pages

Britain from the 1990s to the Millennium