Kate Middleton is ‘on the mend’ and has left Windsor for first time since her operation after joining Prince William and their three children for a half-term holiday on the Sandringham estate where they could also pay a visit to King Charles

It’s been a worrying week for royals, with Buckingham Palace announcing on Monday that King Charles has been diagnosed with cancer. So I am delighted to bring some cheering health news.

The Princess of Wales, who underwent ‘successful’ planned abdominal surgery more than three weeks ago, is recovering.

And, in a clear sign of her improvement, she was able to join her husband Prince William and their three children as they left yesterday morning for a half-term holiday at the Sandringham estate in Norfolk, where the King is also busy to restore. .

“Catherine is recovering well,” a friend tells me. “She was looking forward to a change of scene and will be able to take it easy in Norfolk while the children blow off steam with William.”

The Princess (42) was discharged 12 days ago from the London Clinic, where she spent almost two weeks.

The Princess of Wales, who underwent ¿successful¿ planned abdominal surgery

The Princess of Wales, who underwent ‘successful’ planned abdominal surgery

The king began his ¿schedule of regular treatments¿ on Tuesday, although palace officials did not give details of what type of cancer

The king began his ‘schedule of regular treatments’ on Tuesday, although palace officials did not give details of what type of cancer

The Princess of Wales was able to join her husband Prince William and their three children as they left yesterday morning for a half-term holiday at the Sandringham estate in Norfolk

The Princess of Wales was able to join her husband Prince William and their three children as they left yesterday morning for a half-term holiday at the Sandringham estate in Norfolk

In the only statement from Kensington Palace about her health, a spokesman said on January 17 that ‘based on current medical advice, she is unlikely to return to public duties until after Easter’.

The spokesperson did not provide details on the nature of her surgery, but sources said it was not for cancer.

Since leaving hospital, without being photographed, Catherine has been at Adelaide Cottage, the family’s four-bedroom home at Windsor Home Park.

Her children, Prince George, ten, Princess Charlotte, eight, and Prince Louis, five, all attend Lambrook School, a 15-minute drive away in Berkshire. They broke up yesterday for a week’s half-term holiday.

While Prince Harry was not invited to Sandringham, and had to settle for a 45-minute meeting with his father and stepmother, Queen Camilla, at Clarence House on Wednesday, Catherine’s family could see the king at Sandringham, depending on the medical advice given he was given.

The king began his “schedule of regular treatments” on Tuesday, although palace officials did not give details on what type of cancer.

Catherine and her family will be staying at Anmer Hall, their ten-bedroom home on the Sandringham estate.

At an air ambulance charity event on Wednesday, William thanked the public for their ‘kind messages of support’. He told the guests: ‘It means a lot to all of us.’

A spokesman for Kensington Palace declined to comment.