4chan is already on most of the adult content filters used in the UK at ISP level (along with other such egregious offenders against childhood purity as archive.org) meaning that an explicit request to remove the filter is often required to access it... That it has taken this long to implement a universal block at the ISP level shows that the motive is something other than 'protecting the innocent'.

https://en.wikipedia.org/wiki/Web_blocking_in_the_United_Kin...