Is this an opt in or an opt out filter? Does any one, even for a moment, think that this is going to stop any kid from looking at porn? The techsavy kids are going to brake the system by using free or paid VPNs or TOR, and then tell their friends. Hell, if I was a kid in UK right now, I would make money selling preconfigured FireFox instances with VPN credentials to my peers. Hmm... maybe really it David Cameron's roundabout way of getting teenagers interested in hacking and computers?!?