Should King Charles have announced the news of his cancer?

Everyone seems to agree that it is better for royal personages to be open if they have cancer. It helps thousands of other sufferers and their families. But nowadays sheer necessity is part of it: the omnipresent video evidence of the monarch’s daily life makes it unavoidable that people will notice physical changes. This applies to our present King. In her recent biography, George VI and Elizabeth, Sally Bedell Smith gives an excellent account of the illness of George VI, which probably began in 1949 and killed him in February 1952. Even in those days, people did begin to notice. She quotes Harold Nicolson, as early as March 1950, hearing from Paddy Leigh Fermor that the King, at an investiture, had to be ‘heavily made up with sun tan and rouge’ to conceal the pallor of the invalid. The following year, Princess Elizabeth led the Sovereign’s Parade on a horse called Winston, because the sovereign himself, her father, had cancelled his public engagements for six weeks.