Why is the introductory theme of "I'm Sorry I haven't a Clue" that pretty distinctly "German" melody?

Posted by Muted_Reflection_449@reddit | AskUK | View on Reddit | 14 comments

I think the question is pretty clear, I'll only supply that Wikipedia says that the melody, which is also that of the German national anthem, was composed for German hymns originally and used in Austria. Why did the BBC (?) use that? 🤔 Thank you!