Society of Post Office Engineering Inspectors and successive bodies circular letters to Council, 1937-75; Circular letter to branch secretaries, 1937-46 and 1947-52; Annual conference agendas and minutes, 1921-74; Subject and correspondence files especially on the origins of 'Whitleyism', pay, productivity, grading and promotion, accommodation and welfare; Post Office Engineering Departmental Whitley Council circular letters to staff, 1945-1962 (incomplete); Post Office Engineering Inspector, 1914-29 Society of Post Office Executives Review, 1938-73; Society of Post Office Executives pamphlets and rulebooks.
Society of Post Office Engineering Metropolitan/Central Committee Minutes, 1902-17; Monthly circulars, 1914-1920.
London Telephone Traffic Officers' Association minutes and related papers and Telecommunications Traffic Association, minutes and related papers, 1905-69.
Society of Telecommunication Engineers, General Purposes Committee Papers, 1943-60; Grading and Salaries Committee Papers.
The Collection also includes Society of Post Office Executives material for Wales and the Border Counties, 1939-1970; Post Office Electrical Engineers Journal, 1927-75, and Liberal Party minutes and papers, 1949-54.