Education
Castle attended Abingdon School and the Grammar School of Portsmouth and, after completing his school education began working as a journalist.
Castle attended Abingdon School and the Grammar School of Portsmouth and, after completing his school education began working as a journalist.
In 1932, he was news editor at the daily newspaper The Manchester Evening News, before he in 1943 as a night editor for the daily newspaper Daily Mirror changed. In 1944 he became deputy editor in chief of Picture Post and later its editor and publisher, before being succeeded by Tom Hopkinson. By the mid-1960s, Castle started his own political career in 1964 when he stood for the Labour Party as Assistant Secretary (Alderman) of the Greater London Council and was elected and he remained there until 1970.
He also was an Alderman of the Council of the Borough of Islington.
Between 1975 and 1979 he was a Member of the European Parliament. By Letters Patent of 18 June 1974 he was created a life peer with the title Baron Castle, of Islington in Greater London and was a member of the House of Lords until his death. From 3 July 1975 to till his death in 1979 he served as a Member of the European Parliament and was one of the first representatives of the Labour Party in the European Parliament.