This section applies in any case where—
the premises comprised in the tenancy or any part of the premises without the consent of the landlord or some other person, but
In this section and section 2 of this Act—
Where there is served on the person who may consent to a proposed transaction a written application by the tenant for consent to the transaction, he owes a duty to the tenant within a reasonable time—
Giving consent subject to any condition that is not a reasonable condition does not satisfy the duty under subsection (3)(a) above.
For the purposes of this Act it is reasonable for a person not to give consent to a proposed transaction only in a case where, if he withheld consent and the tenant completed the transaction, the tenant would be in breach of a covenant.
It is for the person who owed any duty under subsection (3) above—
and, if the question arises whether he served notice under that subsection within a reasonable time, to show that he did.