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Head of General Department (and Defence from 1940 until 1956): Sir William Robinson, G.C.M.G.: Richard P. Ebden, C.B.: Sir Ernest E. Blake, K.C.M.G.: Richard P. Ebden, C.B.: Francis R. Round, C.M.G.: Sir C. Alexander Harris, K.C.M.G., C.B., C.V.O.: Terence C. Macnaghten, C.M.G., C.B.E.: Alexander Fiddian: Owen G.R. Williams, C.M.G.: Alexander Fiddian: Roland V. Vernon, C.B.: Sir John A. Calder, K.C.M.G.: Edmund B. Boyd, C.M.G., C.V.O.: Sir John A. Calder, K.C.M.G.: Andrew B. Acheson, C.M.G.: Trafford Smith, C.M.G.: John S. Bennett, C.M.G.: Ian B. Watt, C.M.G.:
1870-1874 1874-1879 1879-1880 1880-1896 1896-1907 1907-1917 1917-1919 1919-1926 1926-1928 (and Establishments) 1928-1930 1929-1937 1937-1939 1939-1940 1940-1942 194 -1948 1948-1953 1953-1956 1956-1959
Head of Defence Department( Defence, Intelligence and Security Department from 1961 until 1963; Defence and Intelligence Department from 1965 until 1966: Archibald Campbell, C.M.G.: R.J. Vile: J.N.A. Armitage-Smith: Robert M. Blaikley:
1956-1959 1959-1961 1961-1963 1965-1966
Head of Intelligence and Security Department(until 1955 until 1961): Sir N. Duncan Watson, K.C.M.G.: J.N.A. Armitage-Smith:
1955-1960 1960-1961