Nope, apparently there’s more than one proudly nude granola bar out there. Whodathunk?
Sung by a man. It’s kind of uptempo. It’s kind of a jokey song. The hook was that he never really listened to her so she left him. Like I said, it got heavy play on the major station for a while. Big mystery to me.
I appreciate your taking a shot at it. If you pursue it farther, the “blah blah blah, something something something” are the actual lyrics - not a placeholder for lyrics I can’t remember.
Just to show you how I google-able this is, I think I remember there being a similar thread somewhere (here?) where someone was also trying to find this song. Now I can’t even re-find that thread.
Challenge accepted 
Pre-1950 Google book search for “caer bannog” (with a space) brings up resource linking “bannog” to the old fashioned spelling “bannauc”
(Doing this to be helpful, not just because I’m a dweeb with no life. I mean, yeah, that too obviously, but not JUST that)
Season 4, Episode 7 “Wedding Preparations”, right at the very end of the episode.
“What about your wedding in Kenya?”
“Oh, it was summer so we had the service in the garden. Some of the male guests wore shorts. Great baggy khaki jobs with legs of about four feet wide. I had flick-ups”.
“Flick-ups! Whatever happened to them?”
“They went the way of the big khaki shorts, I expect. And it rained all day. I was so worried my flick-ups would go limp.”
If you’re looking for dialogue from television shows, most of them have Google-accessible transcripts of questionable legal status (“fair use” for educational and historical purposes). From there it’s a simple search function on the transcript for each episode.
~Max
Don’t take this as gospel, but the first thing this makes me think of is trousers like these, with the cuffs turned up at the bottom