The UK is in an official period of national mourning following the death of Queen Elizabeth II on Thursday.
Here is the day-by-day account of what is expected to happen next, leading up to the Queen's funeral in around 10 days' time. Thursday would traditionally have been D-Day or D+0 in the plans for the aftermath of the Queen's death, codenamed London Bridge.
But the announcement came late in the day - at around 6.30pm on Thursday, September 8 - meaning plans have been shifted a day to allow the complex arrangements to be put in place, meaning D Day was considered to be Friday.
READ MORE: Full list of what you can and can't do as Britain enters national period of mourning
King Charles was joined by the monarch's other children the Princess Royal, the Duke of York and the Earl of Wessex, with the Duke of Cambridge, now heir to the throne, and the Duke of Sussex also travelling there. The King and Camilla - now the Queen consort - remained at Balmoral overnight before returning to London on Friday.
The new King had an audience with the new Prime Minister Liz Truss on Friday, as well as declaring the official state of mourning.
Today (Saturday), the Accession Council meets, traditionally at 10am, at St James's Palace in London to formally proclaim Charles as the new sovereign. First, the Privy Council gathers without the King to proclaim the new monarch and arrange business relating to the proclamation.
Then Charles holds his first Privy Council, accompanied by Camilla and William who are also Privy Counsellors, and makes his personal declaration and oath. The first public proclamation of the new sovereign is read in the open air from the Friary Court balcony at St James's Palace by the Garter King of Arms.
Proclamations are made around the city and across the country. Union flags go back up to full-mast at 1pm and remain there for 24 hours to coincide with the proclamations before returning to half-mast. Charles will also hold audiences with the Prime Minister and the Cabinet.
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