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LONDON, ENGLAND - MAY 31: Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 31:  Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England.  (Photo by Chris Jackson - WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 31: Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 31:  Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England.   (Photo by Chris Jackson - WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 31: Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 31:  Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England.  (Photo by Chris Jackson - WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 31: Queen Elizabeth II signs the Instrument, which is a document, written on vellum, and formally records Her Majesty's attendance at the lunch to celebrate the 70th anniversary of her becoming a Freeman of the Company at Drapers' Hall on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 31:  Queen Elizabeth II  signs the Instrument, which is a document, written on vellum, and formally records Her Majesty's attendance at the lunch to celebrate the 70th anniversary of her becoming a Freeman of the Company at Drapers' Hall on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England.  (Photo by Chris Jackson - WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 31: Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 31:  Queen Elizabeth II visits Drapers' Hall for a luncheon on the occasion of the 70th Anniversary of Her Majesty's Admission to the Freedom of the Company on May 31, 2017 in London, England.  (Photo by Chris Jackson - WPA Pool/Getty Images)