Consent required by virtue of section 97 (landlord's consent to improvements) may be given subject to conditions.
If the tenant has applied in writing for consent and the landlord gives consent subject to an unreasonable condition, consent shall be taken to have been unreasonably withheld.
If a question arises whether a condition was reasonable, it is for the landlord to show that it was.
A failure by a secure tenant to satisfy a reasonable condition imposed by his landlord in giving consent to an improvement which the tenant proposes to make, or has made, shall be treated for the purposes of this Part as a breach by the tenant of an obligation of his tenancy.