The Archive at Sussex records the Party's ideology and activities not only through contemporaneous publications, but in later recollections of leading figures in interviews conducted two decades after Common Wealth's rise and fall. The collection includes the party's official archive and personal papers of Sir Richard Acland and Hugh Lawson (1912-1997), MP for Skipton, 1944-45, together with a collection of taped interviews conducted by Angus Calder in 1964-65 with surviving members of the Party, including Acland, Peggy Duff and Betty Allsop. The Archive is particularly strong on the years of the Party's most vigorous campaigning.
The Common Wealth Papers also hold minutes of meetings, conference papers, a Mass-Observation-authored report on their activities from April 1943, printed leaflets, and local and branch records. A further collection of party material contains pamphlets and series with titles including Austerity is Not Enough; Christians Awake; The Lesser Evil or the Greater Good?; Palestine: The Way Out; and Workers' Control in the Modern World. Periodicals available include the Common Wealth Bulletin, Common Wealth Forum and Common Wealth Quarterly.
Sir Richard Acland's papers include correspondence with, among others, J. B. Priestley, Victor Gollancz, Winston Churchill, Clement Attlee, Anthony Eden, Naomi Mitchison, and the Bishops of Birmingham, Bristol, Chelmsford, Chichester, Ely and Liverpool. There is also a collection of press cuttings. The papers of Hugh Lawson include correspondence with party headquarters, conference papers, the papers of the Skipton by-election Lawson contested (1943-44), papers from his time as an MP (1944-45) and from the General Election campaign of 1945. There is correspondence with, and questionnaire responses from, organisations interested in the party's work. These include the British Medical Association, the National Council of Women of Great Britain, and the National Union of Protestants.