We have used VPNs for several years to watch TV in the UK from here in Spain. Our normal IPs were blocked because we are out of the UK. The VPNs have been very useful and reliable. We used
https://www.witopia.net and it ran like a dream. Nowadays with things like filmon.tv we don't need it so much.
As for Cameron's plans it will be the usual UK legal screw up. As a Brit (unlike some complaining here lol) we have seen it all before. Definitions of what constitutes "pornography" are so variable. Some books/movies have been banned whilst others have gone free. There have been many court cases involving "obscene" publications and what "obscene" constitutes and normally it turns into a farce. Bit like cable/satellite channels. They can show a penis, that's fine, but it can't be erect. Haha they can't even determine what they mean by erect!
I can guarantee it will be a farce but such a mess that the fallout will effect all of us!