King Charles III
“I heard it went around to the now King, his son and other members of the royal household," the financial journalist explained.
The line could stretch for five miles with waits of up to 35 hours expected.
"I’m now a republican because of what I’ve seen over the last week," Paul Powlesland said.
Hundreds have waited at Edinburgh's St Giles’ Cathedral as the late monarch lies in state in the Scottish capital for 24 hours.
King Charles, Princess Anne, Prince Andrew and Prince Edward led the procession behind their mother's hearse.
The new King promised "faithfully to follow" the example of the late Queen in a formal ceremony at Westminster Hall.
Her coffin was greeted with a guard of honour before being carried into the palace.
The new monarch made the announcement as he was officially proclaimed sovereign.
The announcement was made following a meeting of the Accession Council.
Some see the late monarch as the glue who held the country together during her 70-year reign.