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LONDON, ENGLAND - MAY 18: Prince Philip, Duke of Edinburgh holds the hand of Queen Elizabeth II as she proceeds through the Royal Gallery ahead of Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall before the State Opening of Parliament in the House of Lords at the Palace of Westminster on May 18, 2016 in London, England. The State Opening of Parliament is the formal start of the parliamentary year. This year's Queen's Speech, setting out the government's agenda for the coming session, is expected to outline policy on prison reform, tuition fee rises and reveal the potential site of a UK spaceport. (Photo by Toby Melville - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Prince Philip, Duke of Edinburgh holds the hand of Queen Elizabeth II as she proceeds through the Royal Gallery ahead of Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall before the State Opening of Parliament in the House of Lords at the Palace of Westminster on May 18, 2016 in London, England. The State Opening of Parliament is the formal start of the parliamentary year. This year's Queen's Speech, setting out the government's agenda for the coming session, is expected to outline policy on prison reform, tuition fee rises and reveal the potential site of a UK spaceport. (Photo by Toby Melville - WPA Pool/Getty Images)

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LONDON, ENGLAND - JUNE 04: Queen Elizabeth II delivers her speech flanked by Prince Philip, Duke of Edinburgh and Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall during the State Opening of Parliament in the House of Lords at the Palace of Westminster on June 4, 2014 in London, England. Queen Elizabeth II is to unveil the coalition government's legislative programme in a speech delivered to Members of Parliament and Peers in The House of Lords. Proposed legislation is expected to be introduced on a 5p charge for plastic bags in England, funding of workplace pensions, new state-funded childcare subsidy and reforms to speed up infrastructure projects. (Photo by Carl Court - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 04:  Queen Elizabeth II delivers her speech flanked by Prince Philip, Duke of Edinburgh and Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall during the State Opening of Parliament in the House of Lords at the Palace of Westminster on June 4, 2014 in London, England. Queen Elizabeth II is to unveil the coalition government's legislative programme in a speech delivered to Members of Parliament and Peers in The House of Lords. Proposed legislation is expected to be introduced on a 5p charge for plastic bags in England, funding of workplace pensions, new state-funded childcare subsidy and reforms to speed up infrastructure projects.  (Photo by Carl Court - WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 27: Queen Elizabeth II gives the Queen's Speech from the throne in the House of Lords next to Prince Philip, Duke of Edinburgh (R) and Prince Charles, Prince of Wales (2L) and Camilla, Duchess of Cornwall (L) during the State Opening of Parliament in the House of Lords, at the Palace of Westminster on May 27, 2015 in London, England. (Photo by Ben Stansall /WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 27:  Queen Elizabeth II gives the Queen's Speech from the throne in the House of Lords next to Prince Philip, Duke of Edinburgh (R) and Prince Charles, Prince of Wales (2L) and Camilla, Duchess of Cornwall (L) during the State Opening of Parliament in the House of Lords, at the Palace of Westminster on May 27, 2015 in London, England. (Photo by Ben Stansall /WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 18: Prince Philip, Duke of Edinburgh and Queen Elizabeth II prepare to leave the Houses of Parliament after the State Opening of Parliament in the House of Lords at the Palace of Westminster on May 18, 2016 in London, England. The State Opening of Parliament is the formal start of the parliamentary year. This year's Queen's Speech, setting out the government's agenda for the coming session, is expected to outline policy on prison reform, tuition fee rises and reveal the potential site of a UK spaceport. (Photo by Richard Pohle - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Prince Philip, Duke of Edinburgh and Queen Elizabeth II prepare to leave the Houses of Parliament after the State Opening of Parliament in the House of Lords at the Palace of Westminster on May 18, 2016 in London, England. The State Opening of Parliament is the formal start of the parliamentary year. This year's Queen's Speech, setting out the government's agenda for the coming session, is expected to outline policy on prison reform, tuition fee rises and reveal the potential site of a UK spaceport. (Photo by Richard Pohle - WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 18: Queen Elizabeth II and Prince Philip return to Buckingham Palace after attending the Houses of Parliament on May 18, 2016 in London, England. The State Opening of Parliament is the formal start of the parliamentary year. This year's Queen's Speech, setting out the government's agenda for the coming session, is expected to outline policy on prison reform, tuition fee rises and reveal the potential site of a UK spaceport. (Photo by Chris Ratcliffe/Getty Images)

LONDON, ENGLAND - MAY 18:  Queen Elizabeth II and Prince Philip return to Buckingham Palace after attending the Houses of Parliament on May 18, 2016 in London, England. The State Opening of Parliament is the formal start of the parliamentary year. This year's Queen's Speech, setting out the government's agenda for the coming session, is expected to outline policy on prison reform, tuition fee rises and reveal the potential site of a UK spaceport.  (Photo by Chris Ratcliffe/Getty Images)