Harry has purposely confused the reality of his security situation when he is in the UK.
He and his family get British personal protection officers whenever he is in the UK. They cooperate and work in tandem with Harry and Meghans own personal bodyguards. .
What he doesn’t get is a 24/7 team of armed British personal security protection officers twiddling their thumbs waiting until Harry decides to hop on the next flight at a whim to have a boys night out with his buddies. This is what he wants.
He also wants this to lead to being given round the clock British personal protection, no matter where in the world he is, like he had in Canada. 6 teams of British personal protection officers, assigned to them by the government, flying back and forth across the Atlantic on a rota, at the taxpayers expense. (Some of them complained they were regularly sent to do menial personal errands for Harry and Meghan.)
In his latest role as a non working member of the royal family, he has to give 21 days notice to announce he is coming, whether that be a boys night out or whatever else he wants to do, to allow the correct security be put in place, sometimes that may be the armed security he wants and other times it may not be personal armed protection, it all depends on the risk assessment of the experts.
Harry, as we know, lies through his teeth, he did it again in that BBC interview.
Charles has nothing to do with it.