(1)In this section “relevant period” means any period within which anything is required by this Part to be done by either of the parties, that is to say, the applicant and the landlord.
(2)At any time before the end of any relevant period, or any such period as previously extended under this subsection, the other party may, by a written notice served on the party to whom the requirement relates, extend or further extend that period.
(3)Where—
(a)the applicant is the party to whom the requirement relates; and
(b)the relevant period, or that period as extended under subsection (2) above, expires without his doing what he is required by this Part to do within that period,
his application claiming to exercise the right conferred by this Part shall be deemed to be withdrawn, but without prejudice to his making a further such application.