September 15 , 2022
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- Queen Elizabeth II, the longest-reigning monarch of Britain, died on September 8.
- The protocol, including planned ceremonial and political events and the succession of the throne, is known as Operation London Bridge.
- But there were special provisions if the monarch died when she was in Scotland, called Operation Unicorn.
- The term Operation Unicorn was first used in the Edinburgh parliament's online papers in 2017.
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