This small collection is dominated by papers relating to Mr Brocklebank's work as a trade union organiser and leader. There are several files relating to his period as a member of the Executive Committee of the NUAAW (later Agricultural & Allied Trade Group of the T & GWU) between 1970 and 1983 (U DBK/1-6). Other files and volumes cover meetings (with some financial accounts) of District Organisers (U DBK/7), the York County Committee (U DBK/8-15), the North Yorkshire District (U DBK/16-20) and the East Riding District (U DBK/21-22).
Going further afield, his work with the Agricultural Executive Committee for the North Riding of Yorkshire is documented in file U DBK/23, whilst that for various Agricultural Wages Committees (for the East, West and North Ridings, including South Yorkshire) is at U DBK/24-28. There is one file relating to the North East England Advisory Committee of the Forestry Commission, dating from the 1970s.
Two files at U DBK/30-31 cover his association with the Minister of Agriculture, Fisheries and Food (both as Liaison Officer, and member and later chairman of the Northern Regional Panel), whilst his membership of the Central Housing Advisory Committee of the Ministry of Housing and Local Government is covered in files U DBK/32-33. The former files include several letters from Agriculture Ministers Fred Peart, Cledwyn Hughes, John Silkin and Jim Prior between 1968 and 1971. The latter files include letters from several Ministers for Housing & Local Government between 1953 and 1970: Harold Macmillan, Henry Brooke, Anthony Greenwood, and Paul Channon.
There are North Pennines Rural Development Board papers between 1968 and 1971 at U DBK/34-36, and one file relating to the War Agricultural Emergency Committee for the North Riding of Yorkshire (1945-48) at U DBK/37. Another file, U DBK/38, includes some papers of Wath Rural District Council between 1948 and 1972.
The section of miscellaneous files and individual items includes several files which contain numerous press cuttings, articles, speeches, and some letters to the press by Jack Brocklebank (U DBK/42-45) and a small number of personal letters (U DBK/47), plus various items relating to Joan Maynard (U DBK/49). An artificial file of biographical items is to be found at U DBK/54.
Finally, papers relating to the estate of Arthur and Mary Jane Tweedy, of Kirkby Fleetham, of which Mr Brocklebank was executor, are at U DBK/55.