Stupid authoritarian pigdogs at that. You can't block the internet. It doesn't work like that. There will always be porn available, even if it's just on google video. What are they going to do, block individual files? And pay somebody to maintain a massive database of individual files? There will always be a way around it without opting in.
Governments: Please get the hell off the internet. It's new, you're old; you don't get it.
I thought the UK was pretty socialist (in comparison to us, anyway). Not completely, but aren't many of your programs socialist-oriented?
Blocking porn is a pretty socialist thing to do.