This section applies where the landlord has begun proceedings for the possession of a dwelling-house let under an introductory tenancy and—
Subject to the following provisions, the tenancy remains an introductory tenancy until—
If any of the events specified in section 125(5)(b) to (d) occurs, the tenancy shall thereupon cease to be an introductory tenancy but—
Where in accordance with subsection (3) a tenancy ceases to be an introductory tenancy and becomes a secure tenancy, the tenant is not entitled to exercise the right to buy under Part V of the Housing Act 1985 unless and until the proceedings are finally determined on terms such that he is not required to give up possession of the dwelling-house.
For the purposes of this section proceedings shall be treated as finally determined if they are withdrawn or any appeal is abandoned or the time for appealing expires without an appeal being brought.