If the contract-holder gives up possession of the dwelling on or before the date specified in a notice under section 163, 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—
on the day on which the contract-holder gives up possession of the dwelling, or
if an order for possession is made, on the date determined in accordance with section 206.
The notice ceases to have effect if, before the contract ends—
the contract-holder withdraws the notice by further notice to the landlord, and
the landlord 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 secure contracts.