7.—(1) The area of the works authorised by articles 3 and 5 shall be annexed to and incorporated within the Borough of Poole (to the extent that it is not already within the Borough of Poole) when all those works are completed or substantially completed with the exception (as the case may be) of works for which the powers conferred by article 3 have ceased to have effect jn accordance with article 6(1).
(2) Nothing in this article shall require the performance of any functions under the Ordnance Survey Act 1841(1) until the Commissioners have certified in writing to the Director General of Ordnance Survey that all the works authorised by articles 3 and 5 have been completed with the exception (as the case may be) of works for which the powers conferred by article 3 have ceased to have effect in accordance with article 6(1).