49.—(1) Subject to this Chapter, the provisions of this Part apply regardless of the fact that the dwelling concerned is occupied at the particular time by either or both—

(a) multiple tenants,

(b) one or more persons who are also lawfully in occupation of the dwelling as licensees of the tenant or the multiple tenants, as the case may be.

(2) In particular, the fact that the continuous period of occupation, as respects a particular dwelling, by one or more of the multiple tenants is less than 6 months at a particular time does not prevent a Part 4 tenancy coming into existence at that time in respect of the dwelling if—

(a) another of the multiple tenants has been in continuous occupation of the dwelling for 6 months, and

(b) the condition specified in section 28(3) is satisfied.