The collection held at Churchill Archives Centre includes correspondence (including general, official, political, constituency, parliamentary and family correspondence); speeches; Liberal Organisation and Scottish Liberal organisation and Federation material; press cuttings; business papers; and Scottish Office, Scottish Board of Health and Secretary of State for Scotland material.

For the most part, the collection is made up of constituency, parliamentary and Liberal party correspondence of the 1920s and 1930s. There is very little wartime material but Section IV contains correspondence (arranged alphabetically by correspondents' names) and press cuttings from 1945 on into the 1950s. The papers transferred from the Scottish Record Office form a separate and coherent group, consisting of papers of 1923-1937 relating to the Scottish Office, the Scottish Board of Health and Thurso's period as Secretary of State for Scotland. The papers in the first box of Section I are also particularly noteworthy as they include Thurso's correspondence with Winston Churchill from 1915 to 1920.