906. Where landlord is intermediate tenant.

If at any time:

  1.  

    (1)     a dwelling house1 is for the time being lawfully2 let3 on an assured tenancy4; and

  2.  

    (2)     the landlord5 under the assured tenancy is himself a tenant6 under a superior tenancy7; and

  3.  

    (3)     the superior tenancy comes to an end8,

the assured tenancy continues9 in existence as a tenancy held of the person whose interest would, apart from the continuance of the assured tenancy, entitle him to actual possession of the dwelling house at that time