4Execution of declaration
(1)The acquiring authority may execute in respect of any of the land which they are authorised to acquire by the compulsory purchase order a declaration in the prescribed form vesting the land in themselves from the end of such period as may be specified in the declaration (not being less than 28 days from the date on which the service of notices required by section 6 below is completed).
(2)For the purposes of this Act a certificate by the acquiring authority that the service of notices required by section 6 below was completed on a date specified in the certificate shall be conclusive evidence of the fact so stated.
(3)In this Act the "vesting date " in relation to a general vesting declaration means the first day after the end of the period specified in the declaration in accordance with subsection (1) above.