13.—(1) The Department, with the consent of the Department of Finance, may by order subject to negative resolution modify any order made under Article 7 by extending the period for which the area is to remain an enterprise zone.
(2) The power to amend orders conferred by section 17(2) of the Interpretation Act (Northern Ireland) 1954 does not include power to amend an order made under this Article.
(3) The power to revoke orders conferred by the said section 17 (2) does not include power to revoke an order made under this Article before the expiry of the extended period.