141.—(1) If the qualifying person does not comply with a notice under section 140 (landlord’s first notice to complete), the landlord may serve on him a further written notice—
(a)requiring him to complete the transaction within a period stated in the notice, and
(b)informing him of the effect of this section in the event of his failing to comply.
(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) At any time before the end of that period (or that period as previously extended) the landlord may by a written notice served on the qualifying person extend it (or further extend it).
(4) If the qualifying person does not comply with a notice under this section the notice claiming to exercise the right to buy shall be deemed to be withdrawn at the end of that period (or, as the case may require, that period as extended under subsection (3)).
(5) If a notice under this section has been served on the qualifying person and by virtue of section 138(2) (failure of qualifying person to pay rent, etc.) the landlord is not bound to complete, the qualifying person shall be deemed not to comply with the notice.