You're right. They abolished it in the UK in 2010.
Criminal libel - Wikipedia
en.wikipedia.org
I don't know about UK, but I don't think libel has been enforced here as a crime for a long while, regardless of when it was technically repealed. Adultery was a crime in many states until fairly recently, may even still be in some states, but hasn't been enforced in a long while. My guess is Georgia was the last holdout in formally repealing criminal libel.
Though from that linked article - seems that it has at least been occasionally partly-enforced. Or maybe this story is really just about all-too-typical police behaviour? (Getting your ex-wife thrown in jail for bad-mouthing you on Facebook!)
One couple discovered the implications of Georgia’s recently repealed laws during what started as a Facebook spat. After Anne King complained about her ex-husband (a police officer) failing to bring medicine to her house for her and her sick children on Facebook, police arrested King and her friend who commented on the post for “criminal defamation of character.” King was allegedly jailed for about four hours before leaving on a $1,000 bond.
During the hearing, Judge Ralph Todd evidently told the women that they could have had the same discussion verbally and it would not have been against the law, but since she published it for the public to see, it was illegal. The case then went to a state judge who dismissed the charges, saying he didn’t know why King and her friend were in court to begin with. Now King is filing a civil lawsuit against her ex-husband and his colleague for violating her constitutional rights.