It seems that even in Oz, the language was an issue. Here is what the reviewer said:
And many of the comments following the review have to do with the language as well. It seems that middle America and Oz may not be so far removed from each other after all.Billy Elliott - Language
They’re not kidding when they say Billy Elliot contains bad language! If you’ve lived in a community like Billy’s, you’ll know the F-word is so common it barely counts as swearing, so I understand why the writers have peppered it through the dialogue and lyrics so liberally for the sake of authenticity.
Personally, I think they could have toned it down, because it means some young people – as well as some adults – will miss out on seeing this wonderful musical because they object to bad language.