sentences:  He later became chairman of the Export Committee for Israel (1965 to 1968), honorary president of the Joint Israel Appeal, president of the Anglo-Israel chamber of commerce and Chancellor of the Weizmann Institute of Science.In 1974 the British Foreign Secretary James Callaghan asked Sieff to become the UK's Ambassador to Israel, but Sieff declined.Under Sieff's management the Marks & Spencer food department expanded from 14% of total sales in 1956 to over 25% in 1968.