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Johnstone was commissioned into the Royal Corps of Signals from Sandhurst in 1952. He was promoted Lieutenant in 1954, Captain in 1958, Major in 1965, Lieutenant-Colonel in 1970, and Colonel in 1975. He retired in 1979.
- Attorney-General vs The Leveller & Others, British House of Lords hearings, 1 Feb 1979.
- Geoffrey Robertson, The Justice Game, Vintage, London, 1999, ISBN 0-09-958191-4, pp 104-134
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