LONDON, UNITED KINGDOM - JUNE 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Gerald Grosvenor, Duke of Westminster attends a national service of thanksgiving to mark Queen Elizabeth II's 90th birthday at St Paul's Cathedral on June 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JUNE 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Gerald Grosvenor, Duke of Westminster attends a national service of thanksgiving to mark Queen Elizabeth II's 90th birthday at St Paul's Cathedral on June 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)