4N.I.For the purposes of section 5 and section 23(2) a tenancy which is not such a tenancy as is mentioned in subsection (1) of the said section 5 but is a tenancy to which Part I applies and in respect of which the following conditions are satisfied, that is to say—
(a)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
(b)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
(c)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;
shall be deemed to be such a tenancy as is mentioned in the said subsection (1).