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Cover -- Book title -- Copyright -- Table of Contents -- Acknowledgements -- Abbreviations -- Organisational Tables -- Introduction -- 1 The Empire Chain -- 2 The Great War -- 3 GC& -- CS -- 4 The Radio Security Service -- 5 War -- Plate section -- 6 Clandestine Signals -- 7 GCHQ -- 8 Russian Adventures -- 9 A Prime Mole -- 10 Recent Developments -- Appendices: -- 1 GCHQ's Wartime Wireless Traffic Code-names -- 2 Principal Wartime SIGINT Stations in Britain -- Bibliography -- Source Notes -- Index -- Back Cover.

This study examines the role played by GCHQ during the 1960s. It looks at GCHQ's overseas Sigint collection network, its relationship with the NSA and the problems caused by decolonization, economic crisis and military withdrawal from East of Suez. The paper also discusses GCHQ's intelligence targets in the 1960s, its codebreaking successes and assesses how important Sigint was for British policy towards France, Egypt and Indonesia. It concludes that while Sigint gave Britain tactical benefits in dealing with France and Egypt it was only in the case of Indonesia that Sigint helped Britain to achieve its strategic goals.

GCHQ is without question the least discussed of GB's Cold War intelligence services. Yet by most indicators including budget, numbers of staff, or intelligence output -- it was the most important. This essay argues that this reflects not only a greater anxiety on the part of GCHQ to maintain secrecy, but also a disinterest among historians in more technical matters. It reviews some of the limited material available in recently released files relating to GCHQ for the period up to 1970, noting its particular importance in the areas of military intelligence & nuclear targeting. The particular security problems presented by large-scale cryptographic operations are also discussed. Adapted from the source document.