Royal Family Leads the Victory Parade in London 1946

The transcript describes a grand celebration following the Second World War, where 12 million people from various regions gather at Buckingham Palace. The event features a 14-hour pageant led by the royal family, marking a significant moment of victory and innovation not seen since the coronation.

What does the royal family do at the beginning of the pageant?

What is noted about the innovation during the event?