George VI and Queen Elizabeth return to Buckingham Palace after coronation in 1937

On May 12th, 1937, the British public celebrated the coronation of their new ruler, George VI. The event was marked by a grand procession through London, with the royal coach making its way back to Buckingham Palace. The people were filled with joy and pride as they welcomed their king, marking the beginning of a new era for the British Empire.

What were the unknowns that were fortunately still unknown at the time?

Describe the scene as George VI returned to Buckingham Palace.