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There's an operational procedure called London Bridge in the even of the worst happening and it does include announcement time protocols IIRC
https://en.wikipedia.org/wiki/Operation_London_Bridge#:~:text=Operation%20London%20Bridge%20(also%20known,details%20of%20her%20state%20funeral.
Operation Unicorn
"Operation Unicorn is a plan that outlines what would happen if the Queen dies in Scotland. Details about Operation Unicorn were first reported to the public in 2019, although mention of the codename was first made in the Scottish Parliament's online papers in 2017.
Once the death has been made public, Holyrood Palace, St Giles' Cathedral, and the Scottish Parliament will serve as the focal point of gatherings, with a condolence book open to the public set up at the latter location. Parliamentary business will be suspended immediately for at least six parliamentary days, in order to allow authorities to prepare for the funeral. The parliament will then prepare a motion of condolence within 72 hours of reconvening.
The Queen's coffin will first lie in repose at Holyrood Palace, followed by a service of reception at St Giles' Cathedral in Edinburgh. Following this, the coffin would then be transported to Waverley Station and then taken by the Royal Train to London if possible. Otherwise the coffin would be taken by plane to London and welcomed by the prime minister and cabinet ministers."