The Queen's CavalryEpisode 1: The Big EventBBC One Duration: 30 minutesFirst broadcast: Thu 29th Sep 2005, 20:30 on BBC One WestLatest broadcast: Tue 11th Oct 2005, 03:00 on BBC One WalesPracticing for the State Opening of Parliament in the dead of the night - can 150 cavalrymen trotting through central London go unnoticed?GenresFactualHistorySeriesThe Queen's Cavalry Source: BBC Online