British Prime Minister Rishi Sunak hailed the coronation of King Charles on Saturday as a show of the nation's history and a demonstration of its modern character, saying no other country could muster such a "dazzling display".

Charles, and his wife Camilla, will be crowned at London's Westminster Abbey in a show of pomp and pageantry with origins dating back some 1,000 years.

Sunak said it would be a "moment of extraordinary national pride".

"No other country could put on such a dazzling display - the processions, the pageantry, the ceremonies, and street parties," he said in a statement.

"But this is not just a spectacle. It's a proud expression of our history, culture, and traditions. A vivid demonstration of the modern character of our country. And a cherished ritual through which a new era is born."

Sunak said the ceremony at the abbey, where kings of England and Britain have been crowned since 1066, would involve representatives from every faith for the first time.