King Charles III will be “more worried than anyone other than Prince William about” Kate, Princess of Wales, as she recovers from a “serious” condition that required abdominal surgery on January 16. “He’s a huge fan of hers. He thinks she’s a great asset,” royal author and historian Robert Hardman dished. “She’s fit, she’s young, and she’s out of action for three months,” he added. “That’s a cause for concern, not alarm, but he’ll definitely be taking the view, ‘For God’s sake, don’t make her feel she’s got to come back to duties any sooner than she feels she needs to.’ I don’t think there’s a…