The "true colours" thing is from the MSN story, the first in the OP's set of links. It seems to have been slapped on by a careless editor; the story just says "King Charles has shown his continued support for Ukraine." I was hoping to see His Maj festooned in yellow and blue like a mutant Walmart ad and sporting a FUCK YOU PUTIN bracelet like Marie Yovanovitch, but I guess that would have been broken protocol.
Either way, I'm glad that the King did the meeting, glad that Starmer met with Zelenskyy at Downing Street, and glad that people showed up in both locations with a visual/vocal display of support for Ukraine. It is absolutely being reported internationally (I'm in the US at the moment) and coverage like this is useful to Ukraine. And, I think, it's at least slightly comforting to many Ukrainians to know that a lot of people internationally do care and they haven't been forgotten.
(edited because I can't spell)