Saturday marks D-Day+1, or D+1, of the plans following Queen Elizabeth II's death with a timeline of events expected to take place today.
The reason Saturday is D+1 despite the Queen passing on Thursday is that the announcement took place in the late evening, so all plans were shifted to a day later to allow more time for complex arrangements to be efficiently carried out.
Here is a breakdown of what you can expect to happen throughout today in the aftermath of the Queen's death.
Read more: How the Queen responded in one of Manchester's darkest hours
King Charles III's proclamation in London
At 10am, King Charles III will be proclaimed at the Accession Council in the state apartments at St James's Palace in London. It will be attended by privy counsellors with the event being split into two parts.
The first part, the Privy Council will proclaim the new King and formally approve a variety of consequential orders such as the arrangements for the Proclamation - King Charles will not be present for this. Following this, His Majesty will be accompanied by the Queen Consort and the Prince of Wales.
King Charles III's Principal Proclamation
At 11am, the Principal Proclamation will take place, being read from the balcony overlooking Friary Court at St James's Palace. It will be read by the Garter King of Arms, accompanied by the Early Marshal, other Officers of Arms and the Serjeants at Arms.
Flags will also be flown at full-mast from 11am for roughly 24 hours until one hour after the proclamations are made in Scotland, Northern Ireland, and Wales. Then, they will return to half-mast in mourning for the Queen - gun salutes will also take place at Hyde Park and the Tower of London.
At 12pm, a second proclamation will be read at the Royal Exchange in London with additional proclamations being read in Scotland, Northern Ireland, and Wales at 12pm the following day.
The King's audience with the Prime Minister and the Cabinet
At mid-afternoon, the King will hold audiences with Prime Minister Liz Truss and members of her Cabinet.
Court mourning
A period of mourning for members of the royal family and royal households will be observed until seven days after the Queen's funeral - the date of which is yet to be confirmed by Buckingham Palace.
Length of National mourning confirmation
The government is expected to confirm the length of national mourning - most likely around 12 days. This will be observed up to the day after the Queen's funeral.
They are also expected to announce the date of the funeral to be a public holiday as a 'Day of National Mourning'.
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