Where a secure tenant has claimed to exercise the right to acquire on rent to mortgage terms and that right has been established, then, as soon as all matters relating to the grant and to securing the redemption of the landlord's share have been agreed or determined, the landlord shall make to the tenant—
if the dwelling-house is a house and the landlord owns the freehold, a grant of the dwelling-house for an estate in fee simple absolute, or
if the landlord does not own the freehold or if the dwelling-house is a flat (whether or not the landlord owns the freehold), a grant of a lease of the dwelling-house,
in accordance with the following provisions of this Part.
If the tenant has failed to pay the rent or any other payment due from him as a tenant for a period of four weeks after it has been lawfully demanded from him, the landlord is not bound to comply with subsection (1) while the whole or part of that payment remains outstanding.
The duty imposed on the landlord by subsection (1) is enforceable by injunction.