The official Royal Family Website has an online book of condolence.

The Royal UK website, which is the official website for The Royal Family, states: “There are no physical Books of Condolence at the Royal Residences.”

However, there is a virtual Book of Condolence on the Royal website, which is available for anyone to sign. You’ll need to fill out details including your name, email address and location, and then whatever message you wish to leave. The Royal UK website states: “A selection of messages will be passed onto members of the Royal Family, and may be held in the Royal Archives for posterity.”

Please click link  to access the official site and book of condolence

https://www.royal.uk/