(a) the person consents in writing to the
disclosure of that information, or it is generally known that the person has
made the public interest disclosure as a result of the person having
voluntarily identified themselves (otherwise than by making the
public interest disclosure) as the person who made the
public interest disclosure, or
(b) it is essential, having regard to the
principles of natural justice, that the identifying information be disclosed
to a person whom the information provided by the disclosure may concern, or