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(1)If no undertaking under section 264 is accepted by the local housing authority or if, where they have accepted such an undertaking—
(a)any work to which the undertaking relates is not carried out within the specified period, or
(b)the house is at any time used in contravention of the terms of the undertaking,
the authority shall forthwith make a demolition or closing order in respect of the premises to which the notice under that section relates.
(2)The authority shall make a demolition order unless—
(a)they consider it inexpedient to make a demolition order having regard to the effect of the demolition on another building, or
(b)section 304(1) applies (listed buildings and buildings protected by notice pending listing),
in which case they shall make a closing order.
(3)The provisions of this section have effect subject to section 300 (power to purchase for temporary housing use houses liable to be demolished or closed).