The Queen is expected to appear on the Buckingham Palace balcony after the royal standard was raised above the residence.
The flag went up at around 4.31pm, meaning the Queen has arrived at the Palace from Windsor Castle, PA reports. She has not been seen in public since Thursday, the first day of the celebrations.
It comes after the Queen missed Friday's service of thanksgiving at St Paul's Cathedral and yesterday's Epsom Derby due to discomfort caused by mobility issues. However, royal revellers are still hoping she will make a balcony appearance for the carnival’s finale this evening.