J.C. Masterman and the Security Service, 1940–72

Abstract

The significance of J.C. Masterman's relationship with the Security Service, MI5, has not been fully appreciated. As a junior officer during World War II, he consistently sought to achieve good working relations with the Secret Intelligence Service. After the war he continued to take an interest in the Security Service and worked closely with other MI5 elder statesmen to ensure that the successor to Percy Sillitoe as Director-General came from within the Service. Masterman always hoped that his account of the double agents run by British Intelligence during World War II would one day be published. As the public image of the British secret services deteriorated during the 1960s, Masterman believed that MI5 did not grasp how his book could promote its interests, and so he insisted on forcing through publication anyway. The correspondence from serving and former MI5 officers in Masterman's papers vividly illustrate changing attitudes to official secrecy and the declining ability of the British Government to enforce it.