TOPSHOT - Mounted police and members of the Household Cavalry Mounted Regiment ride ahead of a state carriage procession carrying Britain's Queen Elizabeth II and Colombian President Juan Manuel Santos 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 at Horse Guards Parade 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)
