This section has effect where a person is entitled under Part I of the Leasehold Reform Act 1967 to acquire the freehold or an extended lease of a house by virtue of any tenancy ("the qualifying tenancy") and—
(a) has on or before the relevant date given notice under that Act to the landlord of his desire to have the freehold or an extended lease; and
(b) has not acquired the freehold or an extended lease before that date.
The qualifying tenancy shall be treated as an owner's interest as defined in section 2(4) above whether or not the unexpired term on the date of service of the notice of claim is of the length there specified.
If no claim is made in respect of the qualifying tenancy before the claimant has ceased to be entitled to it by reason of his acquisition of the freehold or an extended lease he may make a claim in respect of the qualifying tenancy as if he were still entitled to it.
No claim shall be made by virtue of subsection (3) above after the claimant has ceased to be entitled to the freehold or extended lease but such a claim may be made before the first claim day if it is made before the claimant has disposed of the freehold or extended lease and after he has made a contract for disposing of it.
Compensation shall not be payable before the first claim day on any claim made by virtue of subsection (4) above.
Any notice of a claim made by virtue of this section shall contain, in addition to the matters mentioned in section 3 above, a statement that it is made in respect of a qualifying tenancy as defined in this section and, if made by virtue of subsection (3) or (4) above, sufficient particulars to show that it falls within that subsection.
In relation to a claim made by virtue of subsection (3) above section 4(4)(a) above shall have effect as if the reference to the date of service of notice of the claim were a reference to the relevant date.