Where they don't get that taxpayer protection is if they're traveling around the country and Harry doing his Invictus Games," Nicholl said.
Nicholl observed that the palace showed a strong desire to facilitate the reunion, especially given the King's ongoing cancer treatments and his long separation from Archie and Lilibet.
"Now, Harry is a very wealthy man in his own right. He chose to step down from the royal family.
He's not a working member of the royal family," Nicholl said.
Nicholl emphasized that from a personal standpoint, the King remains eager to spend time with his grandchildren.
"Putting aside his public position and his public role, he's just a grandfather who understandably wants to get to know his grandchildren," Nicholl said.
Prior to these discussions, Prince Harry expressed serious hesitations about bringing his family back to the United Kingdom without enhanced security measures.
"I can't see a world in which I would be bringing my wife and children back to the UK at this point," Prince Harry told the BBC last year.
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A British government spokesman stated that the state does not comment on the specific protective details of high-profile individuals, ensuring that any provisions remain rigorous and proportionate.