70.— (1) The Authority shall, as soon as may be after its establishment, provide itself with a seal.

(2) The seal shall be authenticated by the signature of—

(a) a member of the Authority, or

(b) a member of the staff of the Authority, authorised by the Authority to act in that behalf.

(3) Judicial notice shall be taken of the seal of the Authority and every document purporting to be an instrument made by and to be sealed with the seal of the Authority (purporting to be authenticated in accordance with this section) shall be received in evidence and be deemed to be such instrument without proof unless the contrary is shown.