Grooms and members of the Household Cavalry Mounted Regiment escort the Diamond Jubilee State Carriage carrying Britain's Queen Elizabeth II and Colombian President Juan Manuel Santos during a procession along the Mall  from Horse Guards Parade to Buckingham Palace after a ceremonial welcome at the start of the Colombian president's three-day state visit to the UK in central London on November 1, 2016. 
Colombian President Juan Manuel Santos, who won this year's Nobel Peace Prize for his efforts to implement a peace deal with FARC rebels, begins a state visit to Britain that includes a trip to once conflict-ridden Northern Ireland. / AFP / POOL / NIKLAS HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)