Let me prefix this post with a warning that I may offend people.
Let me also preempt the "Am I porn user" question with the answer of yes, I am a regular consumer of porn.
I have manifold issues with these new laws and the arguments of those that support them, so bear with me, please.
For one, I have an issue with criminalizing sexual interests that run no risk to other human beings. You may argue that simulated rape could lead to actual rape, but I would argue that not all rapists watch rape porn, and not all watchers of rape porn are rapists. The two categories do, of course, overlap somewhere, but similarly, many rapists eat food. Correlation does not imply causation.
Yes, you may have a personal issue with the concept of rape porn, but as long as it isn't hurting anyone, as long as the producers of the material take steps to protect and safeguard the participants from harm, and it is clearly marked as being fictional etc, along with warnings about harming others, then your emotions are your business and should be kept as such. Unfortunately, by criminalizing the production of such material, it's now not possible to regulate its production in the UK, and it will be produced, because there will always be a subset of people who have those kinds of fetishes. I hesitate to draw parallels, and I think this one in particular will get me crucified because it is not a good metaphor, but the "war on drugs" which criminalizes certain things has not been effective because there are always people who will want to purchase drugs, and the producers consist now of people who create said drugs in sheds with rat poison etc, among others. Outlawing something does not control it; outlawing something puts it beyond control.
As for the porn block, it will be laughably ineffective. ISPs have attempted to block things before, most notably being the website "the Pirate Bay", which is one website, which does not go out of its way to avoid being blocked or hiding what it is. That block has failed, with multiple reverse-proxy servers (websites you can go to that deliver the same content) springing up, and it can also be traversed with proxies, VPNs, anonymity tools, and any kind of traffic tunneling. It'll be extremely costly to implement, it may affect your internet experience (the way this will be implemented is a list of terms that will get a website banned, and if it's automated, there will be false positives and harmless websites could get blocked from casual browsing), and, frankly, it's stupid. Child pornography, for example, is not easily accessible on the normal internet; as someone brought up earlier, it's mostly transferred via p2p, steganography, darknets, and so on.
Instead of wasting my money on "blocking" porn in general (as well as child pornography), I would much prefer if the government actually did something about the producers of child pornography. I'm not going to join in self-promoting back-slapping and congratulatory rubbish when children are still being harmed, but instead of doing anything about that, we've decided to throw a rug over child pornography and say how great it is we're protecting kids.
Basically, I don't agree with criminalizing what people enjoy if it doesn't harm anyone (even if I or others find it unpleasant), I don't agree with outlawing something that needs to be regulated and controlled, and I know that the blocking is not only ineffective, but is just an excuse to say that "something is being done".