King Charles will be officially proclaimed Britain's new monarch at a meeting of the Accession Council at St James's Palace on Saturday, Buckingham Palace said.
The 0900 GMT Council meeting, which has two parts, proclaims the new sovereign and see the King sign an oath to uphold the security of the Church in Scotland.
Following the meeting, there will be the Principal Proclamation at 1000 GMT from the balcony overlooking Friary Court at St James's Palace, with other announcements of the new monarch made across the United Kingdom and in the City of London.
Charles's first address as King to be broadcast at 1700 GMT, says palace
King Charles' first address to the nation as Britain's new monarch will be broadcast at 6 p.m. local time (5 p.m. GMT), Buckingham Palace said on Friday, following the death of Queen Elizabeth on Thursday.