The Accession Council will today swear-in Charles III as the King of England following the demise of Queen Elizabeth II.
The historic ceremony is taking place at St Jamesâ€™s Palace this morning.
Flags which were lowered in mourning for the late QueenÂ will fly full-mast after the Accession Council, which will be televised for the first time.
A wave of further proclamations will take place across the UK until Sunday, when flags will return to half-mast.
The ceremony will be attended by members of the Privy Council (a group of senior politicians that formally advise the monarch), and is divided into two parts, and Charles will only be present for the second.
The first part sees the Queen declared dead, the name of the new king read out, and a document signed, and read out from a balcony – it will also be read in Belfast, Cardiff and Edinburgh.
The second partÂ will see King Charles give a personal declaration – he can also say if he objects to any of the oaths he is asked to make.
The King has pledged to follow his â€œdarling mamaâ€™sâ€ life of service in an emotional first address.
He told the nation on Friday evening of his â€œprofound sorrowâ€ at the loss of his mother, praising her warmth, humour and â€œunerring ability always to see the best in peopleâ€.
The King promised to serve the nation with the same â€œunswerving devotionâ€ as the late Queen had during her 70-year reign.