Papers of Maj Gen Ian Helstrip Baker, notably concerning armoured warfare, 1955-2003, including instructions, memoranda, reports and notes on training exercises including Exercise GAMEBIRD, Cyclops Sqn, 2 Royal Tank Regt, Libya, Jul 1964; Exercises OPEN GLOVE and TREBLE CHANCE, Cyclops Sqn, 2 Royal Tank Regt and 16 Parachute Bde Group, Sep 1964; Exercise DOUBLE STRETCH 72, 7 Armoured Bde, Germany, Feb-Mar 1972; Exercise RED RAT, 7 Armoured Bde, Germany, Sep-Oct 1972; MACLEOD, 7 Armoured Bde, Germany, Aug-Sep 1972; Exercise READY RAT, 7 Armoured Bde, Germany, 11 Sep 1972; Exercise LONG LOOK, for 7 Armoured Bde trials of ZB298 radar, Oct 1971-Apr 1972; organisational trial Exercise SQUARE RAT, Germany, 28 Dec 1972; Exercise FIRST STRETCH 73, 7 Armoured Bde, Germany, Feb 1973; Exercise DOUBLE STRETCH 73, 1 Armoured Bde, Germany, Mar-Apr 1973; Exercise HURST PARK 73, 7 Armoured Bde, Germany, Apr 1973; Exercise QUEEN'S PATROL, 7 Armoured Bde, Germany (relating to operations in Northern Ireland), May 1973; Exercise RED RAT 73, 7 Armoured Bde, Germany, Aug 1973; Exercise FOUR SQUARE, 7 Armoured Bde, Germany, Sep-Nov, 1973; photographs of [FV214 Conqueror battle tanks], Royal Armoured Corps, Bovington, Dorset and photograph of an amphibious jeep, partially submerged, 1960; photograph of Crown Prince Birendra of Nepal and others watching a Hornet Launcher vehicle being loaded with Malkara missiles by personnel of Cyclops Sqn, 2 Royal Tank Regt, Candahar Barracks, Tidworth, 15 Apr 1964; captioned photographs relating to Baker's visit to [1 Bn, Royal Green Jackets], Belfast, Northern Ireland, including: battalion personnel on patrol; Falls Road and Hamilton Street, Belfast, showing the aftermath of explosions; IRA weapons discovered, including rifles, knives, an RPG7 rocket launcher and RPG7 rockets, a car bomb and smaller incendiary devices, Aug 1972; photographs of Baker, Nov 1979 and in Brigadier's uniform; handing over briefing notes by Baker as Deputy Assistant Adjutant General, 17 Gurkha Div, Overseas Commonwealth Land Forces, 25 Jun 1962; training instructions for Cyclops Sqn, 2 Royal Tank Regt, Tidworth, Mar 1963-May 1964; briefing notes on the Parachute Sqn, Royal Armoured Corps, by Baker, 1964; Royal Armoured Corps training pamphlet, 'The technique of shooting from AFVs. Part 4: the application of fire from Saladin armoured cars' (MoD, Feb 1967); 1 Royal Tank Regt standing operational procedures, Jun 1969; briefing notes for Baker as Commander, 7 Armoured Bde, by Administration and Quartering staff, 7 Armoured Bde, 18 Jan 1972 and by Brigade Majors, 7 Armoured Bde, 7 Feb 1972; 7 Armoured Bde standing operating procedures relating to headquarters and operations (vol. 1), and administration and logistics (vol. 2), Feb 1972; training directives by Baker as Brigadier Commanding 7 Armoured Bde, Mar-Sep 1972; notes on the creation and history of the Desert Rat badge of 7 Armoured Bde, 1940-1972; training directive by Baker as Brigadier Commanding 7 Armoured Bde, Mar 1973; correspondence and accounts by Lt Col R A Pascoe, 1 Bn Royal Green Jackets, of the battalion's service in Belfast, 8-14 Oct 1972.

Proof copy of article on his military career, 1915-1944, notably concerning his experiments with the transmission and interception of wireless messages and radar, [1962].

Typescript memoir by Cadell, edited by his son Ian V Cadell in 1997, relating to his RAF career, 1925-1945, including details of the establishment of 80 Wing, RAF Countermeasures Unit, 1940, the establishment of the intelligence listening station, Chicksands, Bedfordshire, 1941-1943, and Cadell's role in the development of radar, 1939-1940.

Copies of papers relating to his life and career, 1938-1945, dated 1938-1944, 1971, comprising two flying log books, Jan 1938-Jun 1944; letter to Martin Middlebrook concerning Fernbank's RAF service during World War Two, with particular reference to his involvement in radar intelligence, written in 1971.

Papers relating to his service in the RAF, [1939-1945], 1948, principally comprising official photographs of radar installations, [1939-1945] and RAF operations rooms, [1939-1945], including photograph of operations room of HQ Fighter Command, RAF Bentley Priory, Stanmore, Middlesex, 1939; typescript notes and diagrams about layout and organisation of RAF sector controloperations rooms, [1939-1945]; official photographs of [RAF station], Wunstorf, Germany, 1948.

Typescript unpublished memoir of Squadron Leader Harry 'Wacker' Pain, 1937-1978, including descriptions of: training as an Aircraft Apprentice, RAF Halton, 1937; wireless operator training in Wallace and Wapiti biplanes; airborne wireless operator training, RAF Driffield, 1939; working for Special Duties Flight, Coastal Command, as a gunner in long range Sunderland flying boats, 1939-1942, including survivor searches after submarine attacks, escorting convoys, account of destruction of flying boats Cabot and Caribou, Bodo, Norway, Apr 1940, training messenger pigeons, serious injury in crash and subsequent reposting as Signals Instructor, 1942, and retraining as an Air Traffic Control Officer, 1943. Also anecdotes from various postings including Nutts Corner, Northern Ireland, 1944-1946; opening a new Area Control Centre in Gibraltar, 1946; RAF Mingaladon, Burma, 1947, and RAF Negombo, Ceylon, 1948; Area Control Centre, RAF Watnall, UK, 1949; RAF Gutersloh, Germany, 1954-1957; Air Traffic Controller at RAF Coningsby, 1957-1959; assisting with the introduction of radar guided systems and the formation of Border Radar in RAF Bishops Court, County Down, Northern Ireland, 1959-1962 and RAF Boulmer, Alnwick, 1962-1964; RAF Paya Lebar, Singapore, 1964-1967; as controller, Northern Radar, RAF Lindholme, 1967-1970; RAF Patrington, Withernsea, 1970-1971; Senior Operations Officer, Border Radar, RAF Boulmer, 1971-1973.