Where, in connection with the consideration and determination of an appeal or referral there is before an appeal tribunal medical advice or medical evidence relating to a person which has not been disclosed to him and in the opinion of the chairman, or in the case of an appeal tribunal which has only one member, in the opinion of that member, the disclosure to that person of that advice or evidence would be harmful to his health, such advice or evidence shall not be required to be disclosed to that person.

Advice or evidence such as is mentioned in paragraph (1) shall not be disclosed to any person acting for or representing the person to whom it relates or, in a case where a claim for benefit is made by reference to the disability of a person other than the claimant and the advice or evidence relates to that other person, shall not be disclosed to the claimant or any person acting for or representing him, unless the chairman, or in the case of an appeal tribunal which has only one member, that member, is satisfied that it is in the interests of the person to whom the advice or evidence relates to do so.

A tribunal shall not be precluded from taking into account for the purposes of the determination advice or evidence which has not been disclosed to a person under the provisions of paragraph (1) or (2).