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My mind immediately thought of this:
Theme from Mop and Smiff
and I've not been able to shift it ever since.
I'm guessing no one else had that problem as I've never found anyone who could remember it, but it did exist the internet says so. Sometimes I wonder if I had my own special TV channel when I was growing up, which only I watched. It would explain why no one ever seems to have heard of any of the programmes I've seen...