18.—(1) After the end of the period of five years beginning on the day on which this Order is made—
(a)no notice to treat is to be served under Part 1 (compulsory purchase under Acquisition of Land Act 1946) of the 1965 Act; and
(b)no declaration is to be executed under section 4 (execution of declaration) of the 1981 Act as applied by article 21 (application of the 1981 Act).
(2) The authority conferred by article 25 (temporary use of land for constructing the authorised development) ceases at the end of the period referred to in paragraph (1), except that nothing in this paragraph prevents the undertaker remaining in temporary possession of land after the end of that period, if the land was entered and temporary possession was taken before the end of that period.