As king, Charles III will address both houses of Parliament for the first time.
Approximately 900 MPs and peers will offer condolences to the King at Westminster Hall upon the passing of Queen Elizabeth II.
The King will then proceed to Edinburgh, where the Queen’s casket has been laid to rest.
As her casket goes from the Palace of Holyroodhouse to St Giles’ Cathedral, he will lead members of the Royal Family in a procession.
Speakers from both Houses of Parliament, Sir Lindsay Hoyle and Lord McFall, will address the King on behalf of the MPs and peers at Westminster Hall, which is also where the Queen’s casket will lay in the state later this week.
The monarch, joined by Camilla, Queen Consort, will next deliver a response before approximately 1,200 individuals assembled inside.
During Monday’s visit to Westminster, members of both houses will pledge their fealty to the new queen.
The leader of the Liberal Democrats, Ed Davey, stated that he hoped the departure of the Queen would be a moment of “unity” for the United Kingdom.
People are coming together in their sorrow and appreciation for the Queen, he stated.
After the King sails to Scotland, a procession will follow the Royal Mile to St. Giles’ Cathedral. This journey will mark the beginning of a tour of all four UK nations.
His Majesty will lead members of the Royal Family as they walk behind the Queen’s coffin, which is expected to include the Queen’s other children, Princess Royal, Earl of Wessex, and Duke of York.
The parade is anticipated to draw large crowds to the Scottish capital on Monday, with city council chairman Cammy Day asking people to come to the city center “as swiftly and as early as possible.”
At the cathedral, the Royal Family will attend a service of thanksgiving for her life with members of all segments of Scottish society.
Later in the evening, the King and his family will attend a vigil in honor of the Queen at the cathedral.
The public will have 24 hours to pay their respects at the cathedral before her casket is flown back to RAF Northolt and then transported to Buckingham Palace.
Before that, the King will return to the Palace of Holyroodhouse for a meeting with First Minister of Scotland Nicola Sturgeon.
He and the Queen Consort will then attend the Scottish Parliament, where a motion of condolence will be delivered at 17:30 BST.
Thousands of mourners have left flowers and condolences at her residences, including Buckingham Palace, Sandringham House, and Windsor Castle, since her death at Balmoral on Thursday.
During the Queen’s lying-in-state in Westminster Hall later this week, more than 750,000 people could file past her casket. Those seeking to do so have been advised that wait times could surpass twenty hours.
The Queen Mother was the last member of the Royal Family to lie in state in the hall, the oldest section of the Palace of Westminster, in 2002, when almost 200,000 people lined up to view her casket.
Sir Peter Bottomley, the founder of the House of Commons, predicted that this week “we will see ten times more than that.”
He stated, “It is a wonderful opportunity for people to come through Westminster Hall and feel the modernity and tradition of the monarchy.”
Sir Peter stated that the events of the past few days showed how, within a week, the head of state and the prime minister can be replaced and people can take to the streets “with love and flowers.”
The lying-in-state commences at 17:00 BST on Wednesday and continues until 06:30 on Monday, September 19 – the day of the Queen’s funeral at Westminster Abbey.
