18.—(1) Where, in relation to an annex set out in the Fourth Schedule to this Act or specified in an order under section 17 of this Act, a revised annex incorporating amendments to the first-mentioned annex is transmitted to the Secretary-General of the United Nations Organisation pursuant to Section 38 of the Convention, the Government may by order provide that the first-mentioned annex shall have effect subject to the amendments aforesaid.

(2) The Government may by order revoke or amend an order under this section including an order under this subsection.