The official visit marks the first substantial overseas trip for the couple since the monarch was diagnosed with cancer.

King Charles warned of "overwhelming" climate dangers in an address at Australia's parliament on Monday, saying the growing ferocity of bushfires and floods were an "unmistakable sign" of a sweltering planet.

Charles received a standing ovation before Senator Lidia Thorpe emerged in the chamber and told him: "You are not my King" adding that "genocide" had been committed against the Commonwealth country's indigenous people.