that it took effect before the commencement of this Act at the coming to an end by effluxion of time or notice to quit or the fall of a life or the happening of any other uncertain event of a tenancy which is such a tenancy as is mentioned in subsection (1) of section 5 or is by virtue of this paragraph deemed to be such a tenancy; and

that if this Act had then been in force the tenancy at the coming to an end of which it took effect would have been one to which Part I applies; and

that the tenant is either the tenant under the tenancy at the coming to an end of which it took effect or a successor to his business;