William had been due to attend a memorial service for the late King Constantine of Greece at Windsor Castle.

Kensington Palace would not elaborate further but said the Princess of Wales, who is recovering from abdominal surgery, continues to be doing well.

The Prince of Wales called the Greek royal family who are attending the service to let them know he was unable to attend.

The late King Constantine of Greece, who died in January last year, was William's godfather.

This breaking news story is being updated and more details will be published shortly.

Please refresh the page for the fullest version.

You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow @SkyNews on X or subscribe to our YouTube channel to keep up with the latest news.