This is from the Criminal Justice and Public Order Act
154(4A)
A person is guilty of an offence if, with intent to cause a person harassment, alarm or distress, he— (a)uses threatening, abusive or insulting words or behaviour, or disorderly behaviour, or (b)displays any writing, sign or other visible representation which is threatening, abusive or insulting,thereby causing that or another person harassment, alarm or distress.
It's so sweeping virtually anything bad tempered said in public can get you arrested.
It's an insanely authoritarian law.
I think everyone who supported it has to die first.
To wit:
People still defend the Iraq war
Nobody defends the invasion of Suez.