You're probably thinking about the http://en.wikipedia.org/wiki/Racial_and_Religious_Hatred_Act_2006 http://en.wikipedia.org/wiki/Racial_and_Religious_Hatred_Ac

You're probably thinking about the http://en.wikipedia.org/wiki/Racial_and_Religious_Hatred_Act_2006 http://en.wikipedia.org/wiki/Racial_and_Religious_Hatred_Act... , which makes it an offence to incite racial or religious hatred. That's nothing to do with defamation law; they don't interact.