It is a term of every secure tenancy that the tenant will not make any improvement without the written consent of the landlord.
In this Part "improvement" means any alteration in, or addition to, a dwelling-house, and includes—
any addition to or alteration in landlord's fixtures and fittings,
any addition or alteration connected with the provision of services to the dwelling-house,
the erection of a wireless or television aerial, and
the carrying out of external decoration.
The consent required by virtue of subsection (1) shall not be unreasonably withheld, and if unreasonably withheld shall be treated as given.
The provisions of this section have effect, in relation to secure tenancies, in place of section 19(2) of the Landlord and Tenant Act 1927 (general provisions as to covenants, &c. not to make improvements without consent).
In this section " secure tenancy " does not include a secure tenancy that is a flexible tenancy.