Didn't they try to block porn sites last year? David Cameron ostensibly proclaimed that 'porn sites corrupt the British nation' or something in that vein. The UK is beginning to get a tad too draconian for the 21st century.
There is an on-going tabloid newspaper campaign where they are trying to force the ISPs and politicians (especially the opposition) to adopt or commit to an "opt-in" for porn on Internet connections. That is, the default would be required that ISPs take on the cost and legal culpability to block porn.