I don't know how much new stuff Charles is buying, but John Hitchcock of A&S still has (or has again) a Royal Warrant. Mr Hitchcock and Malcolm Plews often share a car when they have to go see the Prince about one thing or another.
He does get a lot of miles out of his clothes, however. Apparently, he has three valets-- at 8-hour shifts, that's literally 24/7 coverage for cleaning, pressing, repairing, etc.
Also, the McQueen thing needs some careful looking at. There is a decent risk that he spread the story himself.
He's has been back with Hitchcock for a long time - never heard why Plews should go to the Palace. Another Hitchcock goes occasionally.