31. (1) A person guilty of an offence under section 30 shall be liable—

(a) on summary conviction, to a class B fine or to imprisonment for a term not exceeding 12 months or both, or

(b) on conviction on indictment, to a fine or to imprisonment for a term not exceeding 3 years or both.

(2) It shall be a defence for a person who is charged with an offence under section 30 to prove that at the time of the alleged offence the person was not aware, and neither suspected nor had reason to suspect, that the matter alleged to have been published or broadcast was a matter specified in the said section 30.