Practically impossible to "block" access - the stuff is everywhere, porn sites, forums, commercial, non-commercial - we're in wishful thinking "evil bit" territory here.
If it were possible to actually block I'd support it, kids can have their minds perverted by the bottomless pit of thrills Internet pornography is - not the same as old style magazines at all - but it's not possible. Education is probably a better weapon.
Education is the problem, not the answer. Anyone that has been "Highly undereducated " or to be more exact "indoctrinated." by the state at any level in the last forty years, bears testament to it. Why they even speak the same "programmed phrases" every where you turn, you can spot the effected by the use of the now prevalent drivel speak, ie a problem is now an "issue" , as they "move forward " after "reaching out" etc etc..
Perhaps, (as an example of pre pubescent, deliberate natural development interference / alteration ) not asking 4 year olds which sex they would like to be, and criticizing Johnny for not wanting to wear a dress, may prevent said Johnny and Jenny from seeking extra curricular answers online, but then, being taught by someone who they cannot identify as a man of woman, won't be helping anyway.
Even more disturbing that their parents cannot provide answers for them as they are "petrified of the state under threat of " child confiscation" and it's "we are right you are wrong, and you are not permitted to instruct your child anything , that deviates from our program, under the threat of such.
The statement "People of the UK seem to really want to be told what to do" is unfortunately, an accurate assessment.
The malleable "drones" who speak the double speak are here now, but with none of them able to formulate any alternative personal point of view without fear of censure and programmed to bleat at the first sign of intellectual deviance, the future is bleak indeed.That they would further limit Internet freedoms should be of no surprise to anyone, perhaps it's only heterosexual activities that they wish to stop being broadcast, who knows.
Limiting access to pornography, whilst giving your private details to yet another corporation is the least of our worries, or should I say, it should be, but apparently is not.
Remember, the only part of the government that listens to you , is GCHQ, and their corporate friends.