How do people know that the Queen is in London?

There is no sure way of knowing whether the Queen is in London as her locations are not publicly disclosed. However, there are some indicators that may suggest her presence:

- The Royal Standard: When the Queen is in residence at Buckingham Palace, the Royal Standard flag flies from the top of the palace.

- The Changing of the Guard: When the Queen is in London, the Changing of the Guard ceremony is usually performed daily at Buckingham Palace.

- Royal Engagements: If the Queen has a public engagement scheduled in London, it's likely that she is in the city. These engagements are usually announced in advance by Buckingham Palace.

- Press Coverage: If there is significant press coverage or media presence outside Buckingham Palace or other royal residences, it may indicate that the Queen is in London.