" [Don Cherry] looks like a Peacock who imagines himself to be a Bird of Paradise, and a relentless self-publicist"

Exactly! You could hardly have put it better. ;-D

"Can he do anything, or is he just a 'personality'?"

Well...he was a pretty decent NHL hockey player in his youth. He then went into coaching and did that okay too. He then went into being a TV sports commentator and became absolutely notorious after that. He's written a couple of bestselling books about hockey, and is the subject of many hockey videos.

All in all, I'd say he's done quite well, but his genius for self-promotion is probably his greatest asset.

"I'm not in the U.K., so I hope that this doesn't add to your paranoia."

It does, sir (or Madam), it does! I positively quiver with alarm. I fear I shall get little sleep tonight. ;-D