Prince William and Kate spend time with King Charles as Earl Spencer speaks for Harry and Meghan

Amid the fallout from Charles Spencer's book on Diana, Prince William and Kate Middleton spent the weekend in Scotland.

A report said that the Prince and Princess of Wales travelled to Royal Deeside after their visit to the Isle of Bute on Thursday.

Meanwhile, King Charles stayed at his Birkhall home on the Balmoral estate, following two days of engagements at Dumfries House in Ayrshire.

Kate Middleton stayed for two nights before returning to Windsor alone on Saturday morning.

Hello! reported that neither Buckingham Palace nor Kensington Palace would comment on whether William and Catherine spent time with the King.

Prince William's proximity to his father has raised questions about whether Charles Spencer's book Swan Song: Diana, My Sister was discussed.

Royal sources said that Charles Spencer's remarks that Prince Harry and Meghan Markle should be given official security could further fuel Prince William's anger as he is reportedly not happy with the couple's return to the UK.

Spencer's own remarks on William in the book are expected to offend Prince William as he has publicly spoken about discussing his mother.