Incitement to racial hatred is not an especially commonly prosecuted offence. It is what is known as an inchoate offence (inchoate being one of those extraordinary legal words that is almost never encountered outside the courts), that means that it is the potential effect of the defendant's behaviour on others that is of interest. It has been a specific statutory offence for nearly 30 years since the Public Order Act 1986 which, by virtue of section 19, created an offence triable either way:
19.— Publishing or distributing written material.
(1) A person who publishes or distributes written material which is threatening, abusive or insulting is guilty of an offence if—
(a) he intends thereby to stir up racial hatred, or
(b) having regard to all the circumstances racial hatred is likely to be stirred up thereby.
(2) In proceedings for an offence under this section it is a defence for an accused who is not shown to have intended to stir up racial hatred to prove that he was not aware of the content of the material and did not suspect, and had no reason to suspect, that it was threatening, abusive or insulting.
(3) References in this Part to the publication or distribution of written material are to its publication or distribution to the public or a section of the public.
Triable either way means it can be tried in the magistrates' court where the maximum sentence is six months' imprisonment or the Crown Court where the maximum sentence is seven years' imprisonment. When the case first comes before the magistrates' court the magistrate/s will decide whether the maximum sentence that can be imposed there is sufficient in deciding whether to accept or decline jurisdiction. Alternatively the defendant has an unfettered right to choose trial by jury in the Crown Court.
The CPS website contains full guidance on racially aggravated offences part of which I set out below (http://www.cps.gov.uk/legal/p_to_r/racist_and_religious_crime/):