CLEAN: Olympic torch to pass by Buckingham Palace

The transcript describes a person's experience attending a significant event in London, highlighting their long service in the police force and the unique opportunity to police the event. The atmosphere is lively with many tourists, and the event is taking place near Buckingham Palace. The speaker also briefly mentions Shanghai, China, towards the end.

What was the atmosphere like outside Buckingham Palace?

What does the speaker mention about the number of tourists?