The majority of the papers grouped here are Lord Milton's political papers, reflecting his manifold interests and involvements. There are however some of earlier and later date, generated or collected by other members of the Fletcher family.

Alexander Carlyle's papers consist chiefly of journals, sermons, lectures, autobiographical writings, writings on various topics, poetry and papers on church and other affairs. The later papers (MSS.23927-23930) consist of a list of his books, excerpts from his writings and excerpts of proceedings in the action against him by the Presbytery of Dalkeith.

Includes manuscripts and typescripts of published works, including 'Ring of bright water' and 'The rocks remain', and photographs, drawings and notes, together with literary, business and personal correspondence.

With business records of Gavin Maxwell Enterprises, including correspondence and accounts.