18. Evidence by certificate

A certificate by or on behalf of the Minister for Foreign Affairs is conclusive evidence on any question —

whether any country is a State for the purposes of Part 2, whether any territory is a constituent territory of a federal State for those purposes or as to the person or persons to be regarded for those purposes as the head or government of a State; and

whether, and if so when, a document has been served or received as mentioned in section 14(1) or (5).