King Charles III has praised the Queen’s “unequalled reign” after being proclaimed king at a ceremony at St James’ Palace.
The King became the monarch after the death of his mother, but a meeting formally confirmed it on Saturday.
He also approved the day of the Queen’s funeral being a bank holiday, though it is not known what date this will be.
Speaking before the Accession Council, the King said his mother’s death had been an “irreparable loss”.
Meanwhile, senior MPs in the House of Commons, including Prime Minister Liz Truss, have been swearing allegiance to the new monarch.