Duke And Queen's 'Stand-in' at Trooping Rehearsal -- The Duke of Gloucester and Mrs. Doreen Archer-Houblon (on Winston) on their way to the saluting base after making the inspection at to-day's rehearsal. The Duke of Gloucester took the salute at a full dress rehearsal of the trooping the colour on the horse guard parade, London, to-day (Friday). Deputing for the Queen on police horse Winston was Mrs. Doreen Archer-Houblon. She is the wife of major Richard Archer-Houblon, Royal horse Artillery, and a leading authority on side-saddle riding. June 4, 1954. (Photo by Reuterphoto).