This collection consists of De Robeck's naval, official and personal papers. The naval and official papers include Midshipman's Logs, correspondence and Fleet orders. The personal papers include correspondence and diaries.

Many of the papers relate to the Invergordon Mutiny and Tomkinson's subsequent treatment by the Admiralty. The British attacks on Zeebrugge and Ostend in 1918 also feature in some of the documents. Tomkinson left a large number of photographs which illustrate his naval career and his family life.