Directories list government members, departments, and agencies.
DirectGov Website of the UK government
DirectGov: A-Z of central government Lists central government departments, executive agencies and non-departmental public bodies.
Civil Service Year Book Most years from 1974 - 2004; DBW govt JN 106.B82
Diplomatic Service List 1983, 1989, and 1997; DBW govt JX 1783.A22x