Robert Hardy visits and explains some of Britain's most colourful ceremonies.
In the presence of HM Queen Elizabeth The Queen Mother, the Mounted Bands, Trumpeters, Massed Bands, Pipes and Drums of the Household Division, march and countermarch on Horseguards Parade, London, to perform a ceremony which has its origins in a necessary 16th-century routine.
(Repeated: Friday 9.0 pm)