Sir Derek Malcolm Day KCMG (29 November 1927 – 7 March 2015)[1] was a British diplomat and field hockey player who competed in the 1952 Summer Olympics.

[3] Day joined the Foreign and Commonwealth Office in 1951 and went on to serve as UK Ambassador to Ethiopia from 1975 to 1978, and UK High Commissioner to Canada from 1984 to 1987.

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