Angus Derek Iain Jacques Macnaghten was born on 29 May 1914. He was the son of Angus Charles Rowley Steuart Macnaghten and Hazel Enid Irwin. He married Daphne Soper on 1 May 1957. They had one adopted daughter.
He graduated in 1935 with a Eton and Trin College Cambridge Bachelor of Arts (B.A.)
Macnaughten served in World War II as Major in the Intelligence Corps, where he was mentioned in despatches. He died in 1992