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

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

(a) the chairperson of the Board or another member of the Board authorised by it to act in that behalf, and

(b) a member of the staff of the Authority authorised by the Board 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 the Authority and to be sealed with the seal of the Authority (purporting to be authenticated in accordance with subsection (2)) shall be received in evidence and be deemed to be such instrument without proof unless the contrary is shown.

(4) Any contract or instrument which, if entered into or executed by an individual, would not require to be under seal may be entered into or executed on behalf of the Authority by a member of the staff of the Authority or a person generally or specially authorised by the Board for that purpose.