Britain's Prince Philip, Duke of Edinburgh (L) and Britain's Queen Elizabeth II (2nd L) join The First Watch in a Vigil at Grave of the Unknown Warrior after the Service on the Eve of the Centenary of the Battle of the Somme at Westminster Abbey in London on June 30, 2016. Westminster Abbey is holding a Service on the Eve of the Centenary on June 30 2016, and an Overnight Vigil the first time the Abbey has been open all night for a vigil since peace vigils for the Cuban Missile Crisis over fifty years ago. The Abbey service and vigil are part of a programme of centenary events which includes vigils in Scotland, Wales and Northern Ireland, and at Thiepval, Northern France. / AFP / POOL / Niklas HALLE'N (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
