EDINBURGH, UNITED KINGDOM - SEPTEMBER 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Philip, Duke of Edinburgh (r) looks on as Prince Edward, Earl of Wessex blows an air horn to start Sophie, Countess of Wessex off on her Diamond Challenge cycle ride on September 19, 2016 in Edinburgh, Scotland. The Countess of Wessex is cycling 445 miles from the Palace of Holyroodhouse, Edinburgh to Buckingham Palace, London over seven days as her 'Diamond Challenge' Ð a special initiative marking the 60th anniversary of the Duke of Edinburgh's Award. (Photo by Max Mumby/Indigo/Getty Images)