Captain served in the Second World War, JP for Buckinghamshire 1952, Deputy Chairman of the Committees House of Lords 1952 - 1963, Deputy Speaker House of Lords. 1954-1963

On the death of the seventh Earl of Buckingham in 1930, the titles passed to his only son, the eighth Earl. He was Deputy Chairman of Committees in the House of Lords and a Deputy Speaker of the House of Lords. In 1938 he assumed by Royal license the surname of Mercer-Henderson only in lieu of Hobart-Hampden-Mercer-Henderson. He never married and on his death in 1963 the line of the second son of the sixth Earl failed.