Trooping the Colour.
Location of events unknown / unclear.
LS Guards band marching on field. Coach drives towards camera followed by more horses. Fairly close side view of King George V on horseback; followed by other Royals - Prince Arthur, Duke of Connaught; Prince Edward, Prince of Wales (future King Edward VIII, Duke of Windsor) & Prince Henry (Duke of Gloucester) and possibly Prince George, (Duke of Kent).
Shot of these men riding towards camera across field - King holding up flag or banner; followed by long row of others. Again; then the whole row make a wide turn and ride past camera. (Listing says Colonial troops).