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LONDON, ENGLAND - JULY 10: Queen Elizabeth II, Prince Philip, The Duke of Edinburgh and Prince Andrew, The Duke of York prepare to watch the fly past from the balcony of Buckingham Palace to commemorate 75th Anniversary Of The Battle Of Britain on July 10, 2015 in London, England. (Photo by Anthony Devlin - WPA Pool/Getty Images)

LONDON, ENGLAND - JULY 10:  Queen Elizabeth II, Prince Philip, The Duke of Edinburgh and Prince Andrew, The Duke of York prepare to watch the fly past from the balcony of Buckingham Palace to commemorate 75th Anniversary Of The Battle Of Britain on July 10, 2015 in London, England.  (Photo by Anthony Devlin - WPA Pool/Getty Images)