This section applies where—
If immediately before the assignment the former landlord does not remain the landlord of any other premises demised by the tenancy, he may apply to be released from the relevant covenant in accordance with section 8.
In any other case the former landlord may apply to be so released from the relevant covenant to the extent that it falls to be complied with in relation to any premises comprised in the assignment.
If the former landlord is so released from every landlord covenant by which he remained bound immediately before the assignment, he ceases to be entitled to the benefit of the tenant covenants of the tenancy.
If the former landlord is so released from every such landlord covenant to the extent that it falls to be complied with in relation to any premises comprised in the assignment, he ceases to be entitled to the benefit of the tenant covenants of the tenancy to the extent that they fall to be so complied with.
This section applies as mentioned in subsection (1)—