A former royal butler claims staff are "concerned" for King Charles after making his first public appearance since being hospitalised.
The King attended a church service at St Mary Magdalene Church in Sandringham on Sunday alongside Queen Camilla.
King Charles had been admitted to The London Clinic hospital after being diagnosed with a benign enlarged prostate.
The monarch underwent a "corrective procedure" and was discharged after three days. The Princess of Wales was also recovering at The London Clinic after a "successful" planned abdominal surgery.
Former royal butler Grant Harrold says the King's staff are 'concerned'
PA / GB News
The King and Queen appeared in good spirits as they waved to fans at Sandringham.
Ahead of his first public appearance, the Queen had told concerned members of the public that the King was "fine" and "looking forward to getting back to work".
Appearing on GB News, former royal butler Grant Harrold said the King will feel "good to be home" as he recovers from his treatment.
Harrold claimed that "even in hospital" the King would have "carried on working" despite his health concerns.
King Charles and Queen Camilla were spotted at church in Sandringham on Sunday
PA
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Harrold told host Mark Dolan: "Members of the household will be glad to have him home as well, because when you're in a role such as I was you do to an extent become close to them.
"And when they're not well it does concern you, like it does with everybody within the household."
Harrold revealed: "He is one of the hardest working people that I have ever met. I remember in the morning, I'd go in to start my duties and he was already working, and going to bed in the evening he was still working.
"So, you know, this is somebody that literally works every hour that he can. And I think without any doubt, even in hospital, he would have continued working."
Grant Harrold says King Charles is 'one of the hardest working people he's ever met'
GB News
Amid the absence of the Princess of Wales, who is recovering from her surgery, Harrold says both senior royals being temporarily out of action is a "big loss" for the Royal Family.
Harrold said: "And even though he's [King Charles] home, he's not going to stop getting on with the business of being monarch.
"William and Catherine are very much the kind of people that do their own thing and look after themselves. Prince William will be the one waiting on her hand and foot and looking after and making sure that she's getting better, which is why he would have stepped back from public duties as well.
Harrold added: "Queen Camilla has kind of gone up a notch or a couple of notches because she's having to carry out duties on behalf of those other Royals as well."