If you check on ofcoms site, they handily list the actual websites (and ofcom isnt age protected

).
Some of the sites that were run by 8579 LLC have now been transferred to other companies.
Aside from just blocking the UK, these sites can just move companies, leaving the one "fined" as defunct.
Just another example of how utterly clueless the people who dreamed this up are.

None of these sites are likely to be "accidently" viewed (by anyone), you have to go looking for them.
Imagine the ofcom job description ;
"You will be required to spend all day searching the internet for porn sites, and viewing them, to determine if they have age checks".