No way! Banned outright? Wow! I certainly didn’t expect that.
Personally, I do feel that the BBFC does do a good job with protecting the vulnerable against this kind of thing, but it does annoy me that I, being of a sound mind and a totally reasonable, rational person, can’t be allowed to make this decision for myself. That said, I will make this decision myself and I’ll probably import it (presuming an uncut version is released somewhere in the world). But then, there’s nothing stopping anybody from doing the same. I don’t condone piracy, but it’s also an option.
As far as an unrated classification goes, I don’t quite understand this. In the US, who controls it? Is there some regulation as to who can buy unrated movies? I assume the sale of them to children would be illegal? If anything, I think the BBFC would be better off re-introducing the X rating, with an age restriction of perhaps 25, but I don’t think this would offer any addition protection to those that the BBFC is trying to protect.