To mark St George's Day, Diane Louise Jordan visits Windsor Castle to discover what life is like within the walls. An Irish Guard, a professional photographer and a volunteer steward provide a glimpse of this world-famous tourist attraction that is home to the Queen. The Choir of St George's Chapel performs Jubilate Deo by Benjamin Britten, commissioned for them by the Duke of Edinburgh, and the hymns include Jerusalem, Love Divine and O Jesus I Have Promised