I've just listened to this week's Now Show [beware. that link will become next weeks' Now Show around the 21st July]. The first of Mitch Benn's satirical songs* was about Zinedine Zidane, and was entirely in French, without translation. I'm not aware of any other UK radio station that assumes that its audience is savvy enough that this sort of thing will just work. It reminds me of another non-lowest common denominator sketch they did some time ago - the Impressionist driving test. Sadly I can't find any reference to that online.
* 3 minutes 4 seconds into that recording