s 143B Duration of demoted tenancy
(1) A demoted tenancy becomes a secure tenancy at the end of the period of one year (the demotion period) starting with the day the demotion order takes effect; but this is subject to subsections (2) to (5). (2) A tenancy ceases to be a demoted tenancy if any of the following paragraphs applies— (a) either of the first or second conditions in section 143A ceases to be satisfied; (b) the demotion order is quashed; (c) the tenant dies and no one is entitled to succeed to the tenancy. (3) If at any time before the end of the demotion period the landlord serves a notice of proceedings for possession of the dwelling-house subsection (4) applies. (4) The tenancy continues as a demoted tenancy until the end of the demotion period or (if later) until any of the following occurs— (a) the notice of proceedings is withdrawn by the landlord; (b) the proceedings are determined in favour of the tenant; (c) the period of 6 months beginning with the date on which the notice is served ends and no proceedings for possession have been brought. (5) A tenancy does not come to an end merely because it ceases to be a demoted tenancy.