Certain types of porn are illegal in the UK (for example depicting female squirting or face sitting). In April they supposed to introduce age check to all porn websites willing to operate in the UK, which essentially means every website that has porn (for example Reddit) should be behind the pay wall, as age check supposed to be done via credit card transaction. Now this has been delayed, but I don't think they are backing out on that. Furthermore this is going to be a huge problem, because:
1) Payment processors are frowning upon the idea of servicing porn websites. That means it is going to be very expensive to implement unless government figures out a different way.
2) Companies will have to store more personal data about their viewers and users will be forced to give up that data.
3) That poses a huge risk in case of the data breach as someone sexual preferences are sensitive data forced to be collected.
There's a new one coming into effect that will force websites to verify people's age using their ID (possibly by an external provider). Or I guess be blocked? Still a fucking stupid idea.