140.—(1) The landlord may, subject to the provisions of this section, serve on the qualifying person at any time a written notice requiring him—
(a)if all relevant matters have been agreed or determined, to complete the transaction within a period stated in the notice, or
(b)if any relevant matters are outstanding, to serve on the landlord within that period a written notice to that effect specifying the matters,
and informing the qualifying person of the effect of this section and of section 141(1), (2) and (4) (landlord’s second notice to complete).
(2) The period stated in a notice under this section shall be such period (of at least 56 days) as may be reasonable in the circumstances.
(3) A notice under this section shall not be served earlier than 12 months after the service of the landlord’s notice under section 125 (notice of purchase price and other matters).
(4) A notice under this section shall not be served if—
(a)a requirement for the determination or re-determination of the value of the qualifying dwelling-house by the district valuer has not been complied with,
(b)proceedings for the determination of any other relevant matter have not been disposed of, or
(c)any relevant matter stated to be outstanding in a written notice served on the landlord by the qualifying person has not been agreed in writing or determined.
(5) In this section “relevant matters” means matters relating to the grant.