The Duke of Edinburgh takes part in the Champagne Laurent-Perrier Meet of the British Driving Society on the fifth day of the Royal Windsor Horse Show at Windsor Castle in Berkshire, UK on Sunday May 17, 2015. The equestrian show runs from 13th-17th May and is held in the private grounds of Windsor Castle. Photo by Steve Parsons/PA Wire/ABACAPRESS.COM17/05/2015 - Windsor - Photo