The Queen is currently under medical supervision at Balmoral, as confirmed by Buckingham Palace.
The longest serving monarch in British history, Her Majesty is at her Scottish home as she is every summer, where new Prime Minister Liz Truss travelled to earlier this week to be officially appointed.
It has since been reported that doctors are concerned for her health, but she "remains comfortable" at this time, reports the Daily Record. Fears are mounting across the country for Her Majesty's seemingly rapidly declining health and many are asking the question of what exactly happens after the death of the Queen.
READ MORE: Queen Elizabeth under 'medical supervision' at Balmoral as immediate family travel to her side
The plan for the days following the Queen's death is called 'Operation London Bridge', and has every minute detail in place from the minute Her Majesty passes.
If the Queen were to die in Scotland - which is a real concern at the moment - there is an extra plan in place titled 'Operation Unicorn'.
Day One
On the day of her death, the Prime Minister will be one of the first to be informed of the monarch's passing. This message will be delivered by Queen’s Private Secretary and sent to members of the Privy Council Office.
MPs and senior civil servants will receive a call and an email stating: "Dear colleagues, It is with sadness that I write to inform you of the death of Her Majesty The Queen."
This will sit in tandem with an announcement on social media and flags are to be at half-mast within 10 minutes of the news.
On the day of the Queen's death, the soon-to-be crowned King Charles will address the nation in a televised broadcast.
The Prime Minister will hold an audience with Charles, while the Ministry of Defence will organise gun salutes and a minute of silence will be held across the country.
Operation Unicorn
Operation Unicorn is a detailed strategy which entails the entire plan of preparation's for Her Majesty's state funeral.
It is to be rolled out only if the Queen dies in Scotland, with a UK wide plan in place known as Operation London Bridge. This is in place as the Queen spends about three months a year at her Aberdeenshire estate Balmoral Castle.
Should the Queen pass while Holyrood is in session, all parliament occurrences will be immediately suspended.
Day Two
The following morning, POLITICO reports, members of the Accession Council will name Charles the new king and a proclamation will be read out at St James' Palace and the Royal Exchange.
MPs will also give tributes in the House of Commons after the PM's statement the day before.
Her Majesty's coffin will return to Buckingham Palace. The method of travel depends on where she dies, if at Sandringham, her body will be taken by royal train to St Pancras where the PM and cabinet members will be waiting.
Days Three and Four
These days will see King Charles set off on his UK tour, visiting the Scottish Parliament and St Giles Cathedral in Edinburgh, then Northern Ireland's Hillsborough Castle and a service at St Anne's Cathedral, Belfast.
Down in London, meticulous rehearsals for the funeral will be taking place.
Day Five
On the fifth day, a procession will begin, starting at Buckingham Palace and ending at the Houses of Parliament, then a service will be held at Westminster Hall.
The Queen will then lie in state for three days, as members of the public visit to see her coffin.
Days Six, Seven, Eight and Nine
King Charles will visit the Welsh Parliament and service at Cardiff's Liandaff Cathedral.
The Government at this point will be putting finishing touches to their plans for the day of the funeral, as hundreds of thousands of mourners flock to the streets.
Day Ten - The funeral
Employers will not be obligated to give staff a day off, though it will be a Day of National Mourning and a two minute silence held across Britain.
The funeral will take place at Westminster Abbey, followed by a committal service at St George's Chapel, Windsor Castle, where Queen Elizabeth II will be buried the King George IV Memorial Chapel.
What's happening at Balmoral - follow our rolling news blog for updates on Her Majesty's health as we get them.
