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Mandatory Credit: Photo by Alex Lentati/Evening Standard/REX (1138758a) Prime Minister Baroness Margaret Thatcher Waves From Her Car As She Enters Buckingham Palace For The Last Time As Prime Minister To Tend Her Resignation To Queen Elizabeth II. Prime Minister Margaret Thatcher Waves From Her Car As She Enters Buckingham Palace For The Last Time As Prime Minister To Tend Her Resignation To Queen Elizabeth Ii.