Doesn’t have anything to do with what’s necessary. This is about Royal style!
It was leased to them; they pay rent. Reportedly, the lease was last renewed in March 2022. I saw nothing in the reports about rent being waived.
Having a residence in the UK may enable them to remain domiciled in the UK, which may have tax consequences for them. (Of course, there’s nothing to stop them from renting a different residence in the UK, if that is advantageous for them.)
So do Harry and Megan get a refund for the money they refunded for the renovations that they originally paid for with public money?
He gave Prince Edward the Dukedom of Edinburgh as a life peerage for his birthday.
BBC News - King Charles grants Prince Edward Duke of Edinburgh title
That’s annoying, because I really thought I’d nailed the interview. Should have sent a thank you letter I guess.
Clearly nepotism at work.
Yeah, I guess it doesn’t hurt to be an actual relative of the King! Sheesh.
This was indeed the means by which they nailed Louis XVI:
As tensions in Paris rose and he was pressured to accept measures from the Assembly against his will, Louis XVI and the queen plotted to secretly escape from France… Within 24 hours, the royal family was arrested at Varennes-en-Argonne shortly after Jean-Baptiste Drouet, who recognised the king from his profile on a 50 livres assignat (paper money), had given the alert. Louis XVI and his family were taken back to Paris where they arrived on 25 June. Viewed suspiciously as traitors, they were placed under tight house arrest upon their return to the Tuileries.
Just my 'umble opinion, but I think that the Chas and Camilla show has got off to a pretty good start.
They’re certainly sticking to Hitchcock(?)'s rules for actors - “Know your lines and don’t bump into the furniture”. Pretty much as you’d expect from a couple in their 70s.
Two updates:
You want more people to be interested in the Coronation? Have the traditional Oath of Fealty by the Lords (originally done separately by each one - and because it took so long, it was done the day after the coronation; IIRC, at Elizabeth II’s coronation, one of each of the five ranks (Duke, Earl, Viscount, Marquess, Baron) did) be taken on behalf of all of them by one person - Baron Haden-Guest.
With his wife, the Oscar-winning baroness, by his side.
All that malarkey is, for me, the most off-putting mediaevalism of the lot, especially since the hereditary peerage is no longer a primary power in the land. It would make more sense for there to be a Dutch-style shared oath of office for both the head of state and the Speakers of the two Houses of Parliament. But I suppose rationality is the last thing that comes into it.
He should have gone with “King Albert I”! His nickname for sure would have been, “Big Al”. 
Well, not “by his side,” as she isn’t a peer (and I am still not entirely sure of the details as to when she is “supposed to” be called Baroness instead of Lady Haden-Guest), but I have a feeling there will be cameras pointed at her while her husband takes the oath.
And if they really want to handle the Republican protesters, I say, give the King’s Champion something better to do than carry the Union Jack this time.
Did they keep him in a can until his brother abdicated?
Barons are always Lord X, their wives or widows are (Dowager) Lady X. A women who’s a baroness in her own right can choose to go by Lady X or Baroness X.
Well, I hope she’s there, too: Peggy Lee Leather - Wikipedia
It’s not a matter of her choice. She is correctly addressed either way.