Operation London Bridge is 10 days long. The Times have 11 days of coverage prepared by all accounts.
en.wikipedia.org/wiki/Operation_London_Bridge
Preparations for Queen Elizabeth II's death and funeral were made as early as the 1960s, with the plan having undergone multiple changes in the decades since. The plan is updated three times a year through a meeting involving government department officials, the police, and broadcasters.[9][10]
When Elizabeth dies, her private secretary will be the first official (i.e., not one of her relatives or part of a medical team) to convey the news. Their first act will be to contact the prime minister, where civil servants will convey the code phrase "London Bridge is down" to the prime minister using secure telephone lines.[1] The cabinet secretary and the Privy Council Office will also be informed by the private secretary.[3] The cabinet secretary will then convey the news to ministers and senior civil servants. The Foreign, Commonwealth and Development Office's Global Response Centre, based at a secret location in London, will communicate the news to the governments of the 14 other countries of which Elizabeth is queen (the Commonwealth realms), and to the governments of the other countries of the Commonwealth of Nations.[1] Government websites and social media accounts, as well as the royal family's website, will turn black, and the publication of non-urgent content must be avoided.[3]
The media would be informed by announcement to PA Media and the BBC through the Radio Alert Transmission System (RATS) and to commercial radio on the Independent Radio News through a network of blue "obit lights" which will alert presenters to play "inoffensive music" and prepare for a news flash, while BBC Two would suspend scheduled programming and switch to BBC One's broadcast of the announcement.[11] BBC News will air a pre-recorded sequence of portraits, during which the presenters on duty at the time will prepare for the formal announcement by putting on dark clothing prepared for this purpose. The Guardian has reported that The Times has 11 days of prepared coverage ready and that ITN and Sky News have long rehearsed her death, but substituting the name "Mrs Robinson".[1]
A footman would pin a dark-edged notice to the gates of Buckingham Palace. At the same time, the palace website would display the same notice.[1] The Parliament of the United Kingdom and the Scottish, Welsh and Northern Irish parliaments would meet as soon as is practical or be recalled if they are not sitting.[3] The prime minister would address the House of Commons. The new monarch would host a meeting with the prime minister and then deliver a speech to the nation at 6 p.m., the evening following the Queen's death.[3] Whitehall and local government buildings will fly flags at half-mast and books of condolence may be opened; ceremonial ornaments, such as ceremonial maces or council chains, are to be put in black purses.[12][3] Gun salutes will take place at saluting stations and a service of remembrance, to be attended by the prime minister and senior ministers, will be held at St Paul's Cathedral.[3]
Different arrangements for moving Elizabeth's coffin are planned depending on where she dies, including plans for Windsor Castle and Scotland. In the event she dies at Windsor Castle or Sandringham House, the coffin would be taken by Royal Train to St Pancras railway station in London, where the prime minister and cabinet ministers would be waiting.[3] If she dies overseas, the coffin would be brought by No. 32 (The Royal) Squadron to RAF Northolt and then by hearse to Buckingham Palace. In all cases, the coffin would be taken to the Throne Room at Buckingham Palace. Five days after the Queen's death, it would be moved to Westminster Hall and, after a service, lie in state for three days.[3]
Ten days after the Queen's death, a state funeral led by the Archbishop of Canterbury would be held at Westminster Abbey.[13] Her body would then be buried in a prepared tomb at King George VI Memorial Chapel in St George's Chapel, Windsor Castle, alongside Prince Philip, Duke of Edinburgh, whose coffin will be moved from Royal Vault. A committal service would be held at St George's Chapel before the burial.[1][14] As agreed by the Queen and the prime minister, the day of the funeral will be declared a day of national mourning, although a bank holiday will not be granted. A two minutes' silence will take place across the United Kingdom at midday and processions would gather in London and Windsor.[3]
If the Queen dies at Balmoral, then the protocol is going to have to be different. Charles can't meet with the PM in person.
Its interesting about BBC coverage axed until 6pm.
BUT there aren't rumours YET that suggest London Bridge has fallen down (it'll be very difficult to keep it completely quiet for very long at all so it will be a short window between her death and the announcement). The fact she's in Balmoral does mean they can probably get the whole family there BEFORE doing anything further it will make it easier for an information blackout.
I wouldn't be surprised if we ARE in the early stages of a revised plan which is specific for Balmoral though.