(1) This section applies if a person (the asked person ) is asked a question while giving evidence at a tribunal hearing.
(2) A certifying authority may tell the tribunal that, in the authority's opinion, answering the question would not be in the public interest for a stated reason mentioned in section 22I (Non-disclosure certificates).
(3) The certifying authority is a party to the proceeding.
(4) The asked person is excused from answering the question unless—
(a) if the reason stated is, or the reasons stated include, a prescribed reason—the Supreme Court, on a reference under section 84, decides that it would not be against the public interest to answer the question; or
(b) in any other case—the tribunal decides that it would not be against the public interest to answer the question.
(5) If the tribunal decides that it would not be against the public interest to answer the question, the tribunal must give each party written notice of the decision.