http://news.bbc.co.uk/2/hi/uk_news/magazine/7364475.stm
I'm not sure about Britian, but in Canada and US, we have live pay per view events of UFC, which is some fighting compitition where two men essentially beat each other to pulp.
Hollywood produces several movies a year that glorify violence, or simply shows it because it's integral to the plot.
And while I think stuff like child pornography is disgusting and should have laws against it, I fear that this one, with all it's good intent, well affect the private lives of two (or maybe more) consenting citizens looking to have a good time.
The snuff stuff, I have no issues with, but it seems to me atleast that this law tries to outlaw a whole lot of safe bdsm activities.