Charles chatted with well-wishers but made no immediate comment about the recent furore when he arrived for a visit to the Aboyne Community Shed in a village in Scotland to meet representatives involved with local support groups.

The low-key trip, the monarch's first public event of the year, was in stark contrast to the recent high-profile coverage of his son's book, which came a month after the release of a six-part Netflix documentary series about him and Meghan.

Also on Thursday, a smiling and happy-looking William and his wife Kate, who he also criticises in his book, made their first appearances since the memoir's release, to a hospital in northern England. They too made no public reference to the saga.

So far, neither Buckingham Palace nor aides for any of the royals have commented on Harry's disclosures.

Book is popular, Harry isn't

There is no doubting the huge global interest in Harry and what he has to say about his fellow British royals.

Publisher Penguin Random House said the memoir had secured the largest first-day sales total for any non-fiction book it had ever published with more than 1.4 million copies sold in the United States, Canada and the United Kingdom.

It said more books were being printed to meet demand, with the level of interest coming after their Netflix documentary had also attracted record viewers.

However, according to a YouGov poll conducted after the book was published, the fascination is not reflected in popularity, with his once high favourability score among Britons slumping again to a record low. Just 24 per cent had a favourable opinion compared to 68 per cent with a negative view, the poll found.

Among those aged over 65, he and Meghan were even less popular than his uncle Prince Andrew who has been banished from public life over his friendship with late convicted US sex offender Jeffrey Epstein, and a related sexual assault allegation which led to him settling a US lawsuit.

The royal melodrama does not appear to have seriously damaged the popularity of Charles or William though, although the regular poll indicated that the heir's standing, and that of his wife Kate, appears to be on a downward trend.

The monarchy itself has also taken a slight hit, with a rise in the number of people embarrassed by it, although the vast majority remained supporters, the survey showed.

British newspapers reported that in the wake of his revelations Harry would not be welcome to attend his father's coronation in May.

"I'm not going to lie the last few days have been hurtful and challenging," Harry said earlier this week.