Papers of political interest, 1909-1995, including papers relating to local and general elections, in Swansea West, 1982-1983; Pontypridd, 1987; Pembroke, 1991-1992; Vale of Glamorgan, 1985-1993; papers relating to the SDP, 1983-1994, including correspondence, minutes, press releases; papers relating to the SDP/Liberal Alliance, 1987-1988; papers of the Alliance Committee for Wales, 1985-1987, including correspondence, minutes of meetings, drafts of speeches, memoranda; papers of the SDP Welsh Council, 1981-1988, including correspondence, minutes of meetings, newspaper cuttings; papers of the Welsh Regional Economic Policy Group, 1981-1982; papers of the Vale of Glamorgan SDP, including CVs of prospective candidates, 1982-1983; personal papers of Peter Sain Ley Berry, [c. 1981]-1988, including correspondence and diaries; printed material, 1977-1995, including SDP policy documents and manifestos; records of the Lloyd George Society, including correspondence, 1975-1993, and printed material, 1909-1991; papers of the Welsh Centre for International Affairs, 1986-1991; and miscellaneous material, 1968-1984. The 2003 Donation, as yet uncatalogued, comprises further papers, c. 1982-2000, relating to the SDP, including papers relating to the Hillhead bye election and miscellaneous Wales in Europe papers.

Papers, photographs and press cuttings, 1931-37, concerning D. L. (David Lewis) Davies (1872-1937), Labour MP for Pontypridd, mostly relating to the 1931 Parliamentary By-election, his work as a politician, and death. Other items include ephemara such as election pamphlets, programmes, and tickets to attend the coronation of George VI and Queen Elizabeth on 12th May 1937.