Prompted I suppose by this article about Stromae in the paper this morning:
I had never heard of him until I went to Belgium for the Wales game recently and he was at the match. Turns out he's pretty massive on the Continent, but I doubt he's really known at all here (probably a bad example given it's not the sort of thing I imagine most disers would listen to in any event, but the general point still stands).
There does seem to be a longstanding aversion in the UK to non-English language music of pretty much any genre (apart from opera).
PS. There are no indie points available for pointing out in this thread that you, personally, have a comprehensive knowledge of the dubstep scene in Slovakia or whatever.