As for the Meddling Prince, he is not the Monarch and has stated quite categorically that he would shut up if he became King. Just as the Queen has done for 50+ years.
Whether he could keep to that we will have to wait and see of course.
I, for one, welcome his meddling because he keeps the various Ministers and Quangocrats on their toes,
on our behalf. He has no power, just a bit of influence, and the people he writes to secretly can (and do) ignore him. But he still makes them think and I like that.
I dispute it is political interfering the word is surely apolitical. He is scrupulously non party political and has treated Tory and Labour Ministers in the same way. No one knows what he would vote for but my guess it would be Lib Dem

Not that he does vote of course.
Did you see that hatchet job by Dispatches a couple of weeks ago? It was just a joke as it was all so one sided I dont recall a single person coming on to give the other side and give it balance. That destroyed much of its impact.
They presented the program as if he was the King and if he was I might have agreed with many of the criticisms they made because I too believe the Queen/King should be seen and not heard.
The point is Charles not the King and is just a Prince and so his secret (and I stress the word secret) writing of letters to the powers that be is very welcome IMO.
Mind you I did agree with their criticisms of his profligacy
Having said all the above, I suspect Charles will probably not be King and he either knows it or prefers not to be anyway. I suspect our next Monarch will be William and I am sure the great unwashed would prefer Queen Kate to Queen Camilla any day