4(1)This ground is that either of the following conditions is met.
(2)The first condition is that—
(a)proceedings have begun for possession of a dwelling-house let on an existing tenancy which is a secure tenancy, and
(b)possession is sought on one or more of grounds 1 to 6 in Part 1 of Schedule 2 to the Housing Act 1985 (grounds on which possession may be ordered despite absence of suitable accommodation).
(3)The second condition is that—
(a)a notice has been served on a relevant tenant under section 83 of that Act (notice of proceedings for possession), and
(b)the notice specifies one or more of those grounds and is still in force.