Clause 9 sets out an expiry period for compulsory purchase powers of five years from the date of Royal Assent. The clause allows the Secretary of State by order to extend this period by not more than five years. Any order extending the time limit for the exercise of these powers is subject to special parliamentary procedure.
Subsection (4) introduces schedule 13, which enables landowners, in the event of an extension to the time limit, to require the Secretary of State to acquire their property interests. If he decides not to, the compulsory purchase powers over the property interest will cease. Similar provisions were included in the Crossrail Act 2008 and the High Speed Rail (London - West Midlands) Act 2017.