Former British prime minister Margaret Thatcher attends the State Opening of Parliament at the House of Lords in Westminster, London in this May 25, 2010 file photo. [Photo/Agencies] 

African National Congress leader Nelson Mandela (R) is greeted by British Prime Minister Margarat Thatcher prior to their talks, at 10 Downing Street in this July 4, 1990 file photo.[Photo/Agencies]