On Monday, six million people are expected to join the Big Help Out volunteer initiative, which Mr Sunak said he hoped would create a legacy of volunteering for “years” to come.

The Marchioness of Lansdowne, 68, the Queen’s close friend and companion, who attended her throughout the day, said both Charles and Camilla were “extremely” tired after the Coronation but “so proud of how it went”.

Buckingham Palace said Their Majesties were “deeply touched” by the outpouring of support throughout the celebrations.

A spokesman said the couple were “profoundly grateful both to all those who helped to make it such a glorious occasion – and to the very many who turned out to show their support in such numbers in London and further afield”.

Meanwhile, it emerged that despite family tensions, the King raised a toast to his grandson, Archie, at a family lunch at Buckingham Palace after the Coronation ceremony.

Before the meal began, Prince William stood and congratulated his father on such a momentous day.

The King thanked everyone who had made the day so special before raising a glass to his three grandchildren Prince George, who served as a Page of Honour, Princess Charlotte and Prince Louis, who had all behaved impeccably.

But he made a point of also toasting “those that weren’t there” and wished his other grandson a very happy birthday “wherever he was,” according to reports.