This particular guy was located in Wales. Speech is protected under European and UK law, but I'd say that it's not quite the same extent as in the US. For example, there are particular laws against defamation, harassment or racism in speech. One particular law his actions may violate is this:

(1) 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.

http://en.wikipedia.org/wiki/Intentional_harassment,_alarm_o...