If the contract-holder gives up possession of the dwelling on or before the date specified in a notice under section 173, the contract ends on the date specified in the notice.
If the contract-holder gives up possession of the dwelling after that date but in connection with the notice, the contract ends—
(a) on the day on which the contract-holder gives up possession of the dwelling, or
(b) if an order for possession is made, on the date determined in accordance with section 206.
The notice ceases to have effect if—
(a) before the contract ends, and during the period of 28 days starting with the day on which the notice was given, the landlord withdraws the notice by giving further notice to the contract-holder, or
(b) before the contract ends, and after the end of the period of 28 days starting with day on which the notice was given—
(i) the landlord withdraws the notice by giving further notice to the contract-holder, and
(ii) the contract-holder does not object to the withdrawal in writing before the end of a reasonable period.
This section is a fundamental provision which is incorporated as a term of all periodic standard contracts.