Original: Leonard James Callaghan , Baron Callaghan of Cardiff , KG , PC ( 27 March 1912 -- 26 March 2005 ) , was Prime Minister of the United Kingdom from 1976 to 1979 and leader of the Labour Party from 1976 to 1980 .
Simplified: Leonard James Callaghan , ( 27 March 1912 -- 26 March 2005 ) , was Labour Prime Minister of the United Kingdom from 1976 to 1979 .