Where there has been a disposal of a house by a housing authority and—
the provisions of Schedule 17 apply with respect to the vesting of the house in the authority.
In subsection (1)—
"disposal" means a conveyance of the freehold or a grant or assignment of a long lease;
. . .
"pre-emption provision" means a covenant imposing a condition of the kind mentioned in section 33(2)(b) or (c) (right of pre-emption or prohibition of assignment), the limitation specified in section 157(4) (restriction on disposal of dwellings in National Parks, etc.), or any other provision to the like effect.
The vesting of a house under Schedule 17 shall be treated as a relevant disposal for the purposes of—
Where a conveyance or grant executed before 26th August 1984 contains both—
the latter covenant or provision has effect as from that date with such modifications as may be necesary to bring it into conformity with the provisions of this section.
The preceding provisions of this section do not apply where the conveyance or grant was executed before 8th August 1980.
Where before 8th August 1980 a local authority sold property under the powers of section 104(1) of the Housing Act 1957 (disposal of houses provided under Part V of that Act) and—
the provisions of Schedule 17 apply with respect to the vesting of the property in the authority, but subject to the modifications specified in paragraph 4 of that Schedule.