Queen Camilla holds a vital role in supporting King Charles on royal tours, according to a source. Buckingham Palace is making long-term plans for the King to resume a full programme of international travel next year. The news represents a major health update on the monarch. King Charles was diagnosed with cancer earlier this year and took a short break from royal duties, however, he returned to undertaking engagements in late April this year. King Charles and Queen Camilla have just completed their international tour to Australia and Samoa. A senior palace official said: “The King gets great …