A local authority may serve a notice under this section (a "final letting notice") on the landlord of qualifying high-street premises on any day on which—
an initial letting notice served by the authority is in force in relation to the premises,
the period of eight weeks beginning with the day on which that notice took effect has elapsed, and
either—
no tenancy or licence has been granted, or other agreement entered into, with the consent of the authority under section 196 or in circumstances where consent was not needed because of subsection (3) of that section, or
the authority is satisfied that any tenancy, licence or agreement so granted or entered into is consistent with the contemplated exercise of its powers under section 204.
But the notice must be served in time for it to take effect before the initial letting notice expires.
A final letting notice expires (if it has not been withdrawn or revoked on appeal, and subject to sections 201(6) and 202(6)) at the end of the period of 14 weeks beginning with the day on which it takes effect.