Come to think of it - it COULD have been the US company, advertising on a Buffalo NY AM radio station. We listened to WBEN and WGR etc. They aren't far away. I'm only 10 minutes' walk from where I lived 70 years ago. I'm pretty sure my mother's soap operas came from those US stations. And we got three hours of mystery on Saturday nights. Mike Shane, Bulldog Drummond, Mike Hammer, etc. I can remember being about 4 ft. 9" and wanting to be a guy like those Private Eyes... Yeah, that's probably where I heard the Nationwide commercials.