Spot on, but I think the implications of Cameron's plans are much more dangerous than they're being given credit for. The question isn't how the search engines will prevent people who want to find illegal or unsavoury images from using innocent terms to find them - it's blatantly obvious that they won't be able to. Far more important is how the search engines will filter out adult and illegal content when people are genuinely just searching for teabags. Right now, children and the rest of us are more protected from happening across illegal content than the media would have us think precisely because the search engines can use the absence of offensive/obvious terms in my query (and the text of pages I've visited in the past) to guess that I'm probably after information on tea. As soon as those terms are blocked, and the darker parts of the internet start to focus their search engine optimisation onto everyday terms, it's far more likely that we'll all come across content we didn't want to see. A nudge and a wink might work for buying magazines from under the counter in Soho, but how is Google supposed to tell the difference between an adult searching for "Earl Grey pictures" for titillation, and a 6 year old whose teacher had no idea their school research project could go so wrong...