CertificatesN.I.
13. A document bearing a certificate which—N.I.
(a)is signed by a person authorised in that behalf by the Department; and
(b)states that the document, apart from the certificate, is a record of a decision of an appeal tribunal or of an officer of the Department,
shall be conclusive evidence of the decision; anda certificate purportingto be so signed shall be deemed to be so signed unless the contrary is proved.