Left to right:  Queen Elizabeth II riding Sultan and a groom leading Lord Linley riding Willy of Watersmeet with Prince Andrew riding Valkyrie behind in Windsor Park on 1st April 1967.  This image is one of a series taken by Ray Bellisario who was credited with being the "original paparazzo" and someone who frequently upset the Royal Family with his informal and often unwelcome style of photography.  (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images)