A large team of royal courtiers and senior advisers have been called upon at Buckingham Palace and Clarence House to organise the Queen 's funeral and her son's accession to the throne.
Queen Elizabeth II died peacefully at Balmoral this afternoon, Buckingham Palace announced.
In a statement, the Palace said: "The Queen died peacefully at Balmoral this afternoon.
"The King and The Queen Consort will remain at Balmoral this evening and will return to London tomorrow."
Many courtiers and advisers who have been called to help are vastly experienced, having worked for or closely with the royal household for decades.
However, they have never worked during the momentous occasion of the death of a British monarch and the start of a new reign.
The Earl Marshal
The Earl Marshal is responsible for arranging the State Opening of Parliament.
It is also his duty to organise sovereigns' state funerals and the accession and coronations of new monarchs - which is a task he will now have to perform for the first time.
The hereditary role of Earl Marshal falls to the Duke of Norfolk, the highest ranking duke in England.
The current Earl Marshal is the 18th Duke of Norfolk, Edward Fitzalan-Howard, who inherited the position upon the death of his father in 2002.
Queen's private secretary
The Queen's private secretary Sir Edward Young worked for the monarch for more than 18 years.
He was responsible for supporting the Queen in her duties as head of state - and was also the channel of communication between the sovereign and the Governments, as well as overseas realms.
He will be guiding Charles, the new king, through the coming days, on matters of state and constitutional issues.
He will work closely with the Government in the run-up to the Queen's funeral and beyond to keep the monarchy functioning smoothly.
Charles's principal private secretary
Charles's longstanding top aide, Sir Clive Alderton, has been at his side as his principal private secretary since 2015.
He was made a Knight Commander of the Royal Victorian Order by the Queen in 2022.
He will be working closely with Sir Edward Young in the coming days and months on Charles's official programmes, speeches and his role as King.
It will be up to the new King to personally decide who to appoint as his main private secretary - whether Sir Clive or Sir Edward or an entirely new addition to the team.
Master of the Household
The Master of the Household at Buckingham Palace is Vice Admiral Sir Tony Johnstone-Burt and his department is the largest in the royal household, with over 250 employees.
The Master will have to ensure the palace continues to run like clockwork for the royal family as its members mourn the loss of the Queen.
The Lord Chamberlain
Lord Chamberlain - Baron Parker of Minsmere - is the most senior official of the Royal Household.
The former MI5 spy chief headed the Queen's working household and it is his job to ensure the smooth running of all the different departments.
On ceremonial occasions, the Lord Chamberlain carries a white staff and a gold key, the symbols of his office.
Tradition dictates that the Lord Chamberlain must now break his white staff over the Queen's grave - a symbolic gesture marking the death of the sovereign he serves.
Ladies in waiting and equerries
Camilla as the new Queen is likely to appoint a series of Ladies-in-Waiting.
The loyal assistants will have a variety of duties including attending to private and personal matters for the Queen Consort and handling her correspondence.
Angela Kelly
The Queen's senior dresser and personal adviser will be mourning her close friend and lifelong employer.
Angela Kelly is likely to be in charge of selecting the monarch's funeral gown or robes.
She oversees the teams of seamstresses who may be called upon to help prepare the royal family's mourning clothes and funeral attire.
Press Office
The Queen's communications secretary and team of press officers will be on hand to deal with the deluge of inquiries from journalists around the world in the days ahead.
They will be tasked with maintaining the royal website and social media accounts in memory of the Queen, and holding briefings on the funeral masterplan.
