The collection is concerned almost entirely with Worsfold's association with Milner until the latter's death in 1925. Included is correspondence whilst Worsfold was editor of the Johannesburg Star, including letters from Milner; drafts and other papers connected with a biography of Milner; notes and extracts taken from Milner's diaries and correspondence; and articles about the Doullens Conference (held on the 26 March 1918) in which Milner took part.
The collection also contains articles by Worsfold on Imperial questions which appeared in the Nineteenth Century.