The accuracy these filters, or rather their lack of, is a bit of a moot point. The biggest problem from my point of view is that these filters are optional. This means some kids won't be protected by these measures because they will still have access to unfiltered Internet content. One draconian option could be to make the filters mandatory for everyone, but even Cameron would probably think that that would be a bad idea. I'd like to suggest an alternative, namely that content filters should be mandatory on all Internet connections used by children. The UK public are quite happy with age based censorship in the film & video game industries, and there are plenty of other things that adults can legally do that children can't, so maybe what the government should be doing is to make it an offense to allow a child to have unfiltered access to the Internet.