Queen Eliziabeth the Second is currently under medical supervision at Balmoral Palace in Scotland.
But what protocoals have been put in place for whenever the Queen passes?
A plan known as Operation London Bridge has been established many years ago.
The hugely detailed plan has everything in place from the very moment the Queen passes away.
From flag etiquette, to days of mourning, the protocols cover every base of life after the announcement that much of the public will find devastating.
London Bridge Is Down
Once the Queen has passed, Operation London Bridge begins. As we learned from The Crown, the death of Elizabeth's father King George VI was known as Hyde Park Corner while that of the Queen Mother was Tay Bridge.
So, once London Bridge is down, the Queen's private secretary Sir Edward Young, KCVO will be responsible for informing the Prime Minister before the information is released to the 15 other countries where the Queen is head of state and the rest of the 36 Commonwealth nations. This is done by the Foreign Office’s Global Response Centre which is housed at an unknown location in London.
The first time the public becomes aware of her death is when a notice is placed on the gates of Buckingham Palace. All staff will wear a black armband on the left arm, which must measure three-and-a-quarter inches wide.
A statement will then be released to the Press Association and other news outlets. At this stage main TV channels will pull regular programmes and newsreaders will wear black suits and ties. DJs on-air will see a blue light flash, which means to cut to news ASAP. And blanket coverage will begin.
The press scramble
At ITV and Sky, staff has used the codeword, Mrs. Robinson, for years to refer to the death of the Queen. And once the news is public, news outlets will release ready-made stories about her life, reign, and legacy. While the scramble for space at all main locations will begin. Specific spots next to Canada Gate, at the bottom of Green Park, have already been agreed by BBC, ITV, Sky, and others.
King Charles III
As soon as Queen Elizabeth dies, Prince Charles will become king. He is permitted to choose his own name, and is expected to become King Charles III. At this stage, a meeting of the Accession Council will take place at St James' Palace and all formalities will take place. He will be named King one day after the Queen's death and after his siblings have ceremoniously kissed his hand. Proclamations will be made and while the Queen lies in state, Charles will visit Scotland, Northern Ireland, and Wales. His first words as monarch will take place at St James's Palace.
The coronation of King Charles III will be planned a few months after the funeral, and the title of Prince of Wales will move to Prince William, although not immediately.
Before the funeral
There will be an expected 10 days between the Queen's death and her funeral during this time her body will remain at Buckingham Palace so the family can spend time together. She will then be moved to Westminister Hall where she will lie in state for a number of days so the public can pay their respects. More than 200,000 people visited the Queen Mother's body in 2002. And then, on the 10th day, the Queen's body will be moved to Westminister Abbey for a state funeral. The funeral will be attended by state officials from all over the world and will be coordinated by the armed forces and Government.
On the day of the funeral
The country will be given a national day of mourning, (including the stock market) and Big Ben will chime at 9 am on the day. The crown jewels will be cleaned that morning. Before the coffin arrives at Westminister Abbey at 11 am, and the country will fall silent.
What if the Queen dies at Balmoral?
If the Queen dies while in Balmoral, things change slightly. Her body will be moved to Holyroodhouse in Edinburgh and then carried up the Royal Mile to St. Giles Cathedral for a funeral service. By then the public will be notified and will likely line up to throw flowers at the Royal Train, which will carry the body back to London for the burial service.
And if the Queen dies abroad, a coffin will be flown out to her. In fact, royal undertakers, Leverton & Sons, keep what they call a “first call coffin” ready in case of royal emergencies.