Throughout history, there has been no Monarch like her. She is not merely the oldest Sovereign we have ever known. She is the most worldly. She has travelled further than all her predecessors put together. She has met more historic figures than anyone alive - from Churchill to Mandela, de Gaulle, Reagan and Obama. And today, Queen Elizabeth II is no more contemplating retirement than she was when she came to the throne in 1952. She sits at the head of a hereditary institution so often asso...