When Top Cat was shown over here it was shown on the BBC that doesn't allow advertising.
At the time there was a brand of cat food called Top Cat.
The BBC called it Boss Cat. It was Boss Cat in the scheduling in the TV guides and Newspapers.
There was even a comic that featured Hannah Barbera characters where Top Cat was titled Boss Cat and the gang would call him BC.
Now it's one thing doing in a comic, but a TV programme is another thing entirely. The continuity announcer would say that Boss Cat was up next on the BBC, only for the theme tune to begin with "Top Cat...."