Parliament will be brimming with memories of the Queen as MPs and their peers gather to pay their respects in a special session of condolences.
Both houses are to sit at 12 noon to allow members to pay their respects, with normal policy suspended for a period of mourning.
The tributes, led by Prime Minister Liz Truss, are due to last until 10 p.m. Friday.
There will also be a rare Saturday sitting, where senior MPs will swear allegiance to the king from 2 p.m., with condolences continuing until 10 p.m.
This final session will end with a “humble formal address” to the King, “expressing the deep sympathy of the House” following the death of his mother at Balmoral on Thursday, the House of Commons said in a statement.
Each deputy will have the possibility of taking the oath to the King on the return of the Chamber but will not be obliged to do so.
Tributes from Parliament will follow an outpouring of grief from all political walks of life as the world digested the news of the Queen’s death at the age of 96.
Ms Truss hailed the country’s oldest monarch as the ‘rock on which modern Britain was built’, while Sir Keir Starmer, the Leader of the Opposition, said she was ‘a symbol of best of us”.
Boris Johnson was among six living former prime ministers from the Queen’s reign to pay tribute to her, two days after meeting her at Balmoral to step down from office.
He said the Queen had spread “magic around her kingdom” for an “unprecedented” 70 years and had the “simple power to make us happy”.
Commons Speaker Sir Lindsay Hoyle will determine the timetable in the House for the following days, but it is expected to be significantly reduced until the end of the state funeral when Parliament adjourns.
This means that new laws cannot be passed until Parliament returns, although it can be revoked for urgent matters.
Buckingham Palace said the Queen died “peacefully”.
His eldest son became King Charles III.