“(1) A term of a relevant tenancy or regulated tenancy is of no effect so far as the term makes provision (however expressed) prohibiting the tenant from having a child live with or visit them at the dwelling or restricting the circumstances in which the tenant may have a child do so.

(2) Subsection (1) does not apply if—

(a) the provision is a proportionate means of achieving a legitimate aim, or

(b) the landlord or a superior landlord is insured under a contract of insurance—