This means that I want to see statistics with how many British men have strangled their wives/companions/casual encounters, and what percentage of them have previously watched porn featuring choking (and some plausible argumentation that those have strangled their victims because of watching porn and they did not choose to watch such rather unusual porn because they already intended to choke someone).
Without any concrete numbers any such justification is pure BS.
I have watched a lot of porn, but I do not remember ever seeing anything with choking, so I assume that this is a rather niche interest.
Even if this is a restriction that would not affect me directly, I am extremely concerned about this proliferation of laws that punish "crimes of thought", where someone is punished for possession of some kind of information, despite the fact that there exists absolutely no evidence of doing or attempting to do any kind of act against others that would really deserve punishment.
In my opinion, only those who write or vote such laws are criminals who deserve punishment, because only for them it is known with certainty that they have caused harm to other human beings, while against those punished by their laws there exists no evidence of causing harm to others.