18(1)For any purpose other than those mentioned in sub-paragraph (2) below, a document is validly executed by SNH if it is signed on its behalf by a member or by the chief officer or by a person authorised to sign the document on its behalf.
(2)For the purposes of any enactment or rule of law relating to the authentication of documents, a document is validly executed by SNH if it is subscribed on its behalf by being executed in accordance with the provisions of sub-paragraph (1) above.
(3)A document which bears to have been executed by SNH in accordance with sub-paragraph (2) above shall, in relation to such execution, be a probative document if—
(a)the subscription of the document bears to have been attested by at least one witness; or
(b)the document bears to be sealed with the seal of SNH.