Act of one of multiple tenants cannot prejudice the other's or others' rights.
51.—(1) Without prejudice to subsection (3), no act done by any one or more of the multiple tenants of a dwelling that, apart from this subsection, would have either of the following results, namely—
(a) the termination of the Part 4 tenancy, or
(b) rendering the Part 4 tenancy liable to be terminated by the landlord,
shall have either such result if another of those tenants provides an explanation or information to the landlord from which a landlord acting reasonably in the circumstances would conclude that that act was done without that person's consent.
(2) For the purposes of subsection (1) a landlord acts reasonably in the circumstances concerned if—
(a) he or she requires the last-mentioned tenant in that subsection to provide such information or assistance as he or she may reasonably need to ascertain with whose consent (if any) and by whom the act concerned was done, and
(b) in case that requirement is not complied with, he or she concludes, on account of that non-compliance, that the act concerned was done with the tenant's consent.
(3) Instead of the result mentioned in paragraph (a) or (b) of subsection (1), an act referred to in that subsection that is shown to have been done without the consent of one or more of the other multiple tenants results in—
(a) the tenant responsible for the act (and any tenant who consented to that act) losing the benefit of the protection, if he or she otherwise has the benefit of it, of the Part 4 tenancy, or
(b) the rendering of the benefit for him or her (and any tenant who consented to that act) of that protection, if he or she otherwise has the benefit of it, liable to be terminated by the landlord in accordance with this Part as adapted by subsection (4),
as the case may be.
(4) For the purposes of subsection (3), any provision of this Part which—
(a) provides for the termination of a Part 4 tenancy,
(b) renders such a tenancy liable to termination by the landlord, or
(c) makes provision incidental to, or consequential on, the foregoing,
shall, in relation to a case to which that subsection applies, be construed and operate as a provision which, as appropriate—
(i) provides for the loss of the benefit of the protection of the Part 4 tenancy for the tenant or tenants concerned,
(ii) renders the benefit for that tenant or those tenants of that protection liable to be terminated by the landlord, or
(iii) makes provision incidental to, or consequential on, the matter referred to in paragraph (i) or (ii).
(5) Without limiting the generality of the foregoing, such adaptation of this Part allows the landlord to obtain a determination under Part 6 requiring the tenant who is in default to vacate possession of the dwelling concerned (without prejudice to the other multiple tenant's or tenants' possession of the dwelling).
(6) For the purpose of subsection (4), Part 5 has effect as if every provision it makes with respect to a notice of termination were a provision with respect to a notice terminating the benefit of the protection of the Part 4 tenancy concerned.
(7) In this section a reference to the doing of an act includes the making of an omission.