It may be different in the UK. They have defamation laws that seem insane to a USA person. (Burden of proof on the speaker to prove what they said is true iirc)
Furthermore, defamation/libel is not covered under criminal law, it’s considered a tort so it would be a civil suit.
So no, not at all like the UK.
EDIT: But yeah sure if you want to try to defend your point, start linking cases to support the claim.
I am confident in stating the UK has much weaker free speech laws and no constitution to base free speech protections on. FFS, this is the country a dude was arrested and fined for filming his dog doing a hitler salute. We have had a few cases not related to violence in the US but they usually end up overturned even when there’s a conviction (thinking of this guy as an example: https://en.wikipedia.org/wiki/Douglass_Mackey )