Papers relating to his life and career, 1924-1971, principally comprising papers relating to his work as British Ambassador to Jordan, 1956-1959, including newspaper cuttings concerning the termination of the Anglo-Jordan treaty of 1948, 1956-1959, and correspondence relating to the stationing of British troops in Jordan, 1958; papers relating to his work as Governor, Commander-in-Chief and High Commissioner, Aden, 1960-1963, dated 1960-1970, including his official reports to the Foreign Office on his visits to the Protectorate states, 1960-1962, his correspondence with King Hussein of Jordan, 1960-1962, newspaper cuttings relating to the merging of Aden with the South Arabian Federation of Arab Emirates, 1960-1963; correspondence concerning British policy towards the South Arabian Federation, particularly the withdrawal of British troops from Aden, 1964-1970; his official report to the Foreign Office concerning the trials in Madrid of opponents of the Franco regime, 1950; notes, cuttings and correspondence concerning Britain's policy towards Japan, 1931-1941, and the signing of the Japanese Peace Treaty, 1951, dated 1971-1975; notes on Australian personalities and contacts written for Sir Morrice James, Johnston's successor as High Commissioner of Australia, 1971; drafts,typescripts, correspondence and reviews of published memoirs The view from Steamer Point (Collins, London, 1964), Mo and other originals (Hamilton, London, 1971) and The brink of Jordan (Hamilton, London, 1972); notes and fragments of unpublished memoirs, dated 1936-1985, mainly relating to his service in the Foreign Office, 1936-1939, Japan, 1939-1942, and Australia, 1965-1971. Photographs, [1938]-1971, principally comprising official photographs relating to his service in Jordan, Aden and Australia. Papers relating to published and unpublished poetry and translations, principally comprising drafts of For Leagros and other poems (Basil Blackwell, Oxford, 1940), Towards Mozambique and other poems (Cresset Press, London, 1947), Estuary in Scotland (privately published, 1974), Poems and Journeys (Bodley Head, London, 1979), Rivers and fireworks (Bodley Head, London, 1980), Talk about the last poet (Bodley Head, London, 1981), Choiseul and Talleyrand (Bodley Head, London, 1982), The Irish lights (Bodley Head, London, 1983) and translations of Turgenev, Pushkin and Lermontov.

Papers relating to his military career, dated 1946-[1984], notably including typescript account of service of No 1 Independent Infantry Company, Malaya, 1941-1942, dated [1946-1984]; typescript account of experiences of 5 Bn, 14 Punjab Regt in Japanese POW camps, 1942-1945, including details of their work on the Burma Railway, written in [1946-1984]; typescript memoir of Fearon's military career, 1929-1947, written by his wife Diana Fearon in [1984].

Copies of papers relating to his career and the strategic significance of seapower, 1915-1962, including official and personal correspondence, 1915-1936, including letters from Adm Sir Arthur Cavenagh Leveson, Commander-in-Chief, China Station, 1923, R Adm Montagu William Warcop Peter Consett, 1923, V Adm Sir Lewis Clinton-Baker, 1926, Lt Gen John Greer Dill, 1929-1936, Adm Sir Herbert William Richmond, 1929, Maj Gen William Henry Bartholomew, 1929, R Adm Ragnar Musgrave Colvin, Chief of Staff, Home Fleet, 1931, Cdre Andrew Browne Cunningham, 1932; manuscript narrative diary, HMS HAREBELL, Fishery Protection, 1925-1926; typescript copies of lectures given at the Imperial Defence College, 1927-1935; manuscript notes on the history of the Peninsular Campaigns, Napoleonic Wars, 1807-1814 [1928]; published articles by Dickens, letters to the press and book reviews, mainly relating to the Royal Navy and the projection of seapower, 1929-1962; manuscript narrative war diary, 1940-1945, with manuscript notes on the Korean War, 1950; official and personal correspondence, 1940-1945, including letters from Rt Hon Maurice Paschal Alers Hankey, 1st Baron Hankey of The Chart, Chancellor of the Duchy of Lancaster, 1940, letter from Capt Wilfrid Rupert Patterson, Captain of HMS KING GEORGE V, on the sinking of the German battleship BISMARCK, 1941, letters from Adm Sir Andrew Browne Cunningham, 1st Bt, 1941-1944, letter from Augustus (Edwin) John, 1943, letter from R Adm John Anthony Vere Morse, 1943, letter from AF Sir John Cronyn Tovey, Commander-in-Chief, the Nore, 1945, also, typescript report by Dickens to the Admiralty on the German attack on the Netherlands, 22 May 1940 and copy of Adm Cunningham's official signal to the Admiralty on the surrender of the Italian Fleet, Malta, 10 Sep 1943; newspaper cuttings and correspondence relating to Bombing and strategy. The fallacy of total war (Sampson Low, Marston and Company, London, 1947), including letters of congratulation from Adm Cunningham, US Adm Richard L Conolly, Maj Gen John Frederick Charles Fuller, and Cdre Guy Willoughby, 1947; personal correspondence, 1947-1962, including letters from AF Andrew Browne Cunningham, 1st Viscount Cunningham of Hyndhope, 1947-1959, Adm Bruce Austin Fraser, 1st Baron Fraser of North Cape, 1948, Adm Sir (Eric James) Patrick Brind, Commander-in-Chief, Far East Station, 1949, Rt Hon Maurice Paschal Alers Hankey, 1st Baron Hankey of The Chart, 1949, AF Louis (Francis Albert Victor Nicholas) Mountbatten, 1st Earl Mountbatten of Burma, Commander-in-Chief, Mediterranean, 1954, AF Alfred Ernie Montacute Chatfield, 1st Baron Chatfield of Ditchling, 1959, R Adm George Pirie Thomson, 1959; manuscript notes and annotated typescript draft chapters for projected autobiography [1960].

Typescript memoir entitled 'Ships in bottles' covering his life and naval career, 1902-1952, notably his service in the North Sea and the English Channel, 1915-1916, off the West coast of Ireland, 1917-1918, in Turkey, 1922, China, 1927-1929, the Mediterranean, 1934-1936 and 1939-1940, the North Sea, 1941-1942, the Indian Ocean, 1942-1944, at destroyer base HMS DEFENDER, Liverpool, 1944-1945, and in West Africa, 1945-1946.