‘ (6) Any lease or underlease, at a rent, or in consideration of a fine, for life or lives or for any term of years determinable with life or lives, or on the marriage of the lessee, or on the formation of a civil partnership between the lessee and another person, or any contract therefor, made before or after the commencement of this Act, or created by virtue of Part V. of the Law of Property Act, 1922, shall take effect as a lease, underlease or contract therefor, for a term of ninety years determinable after (as the case may be) the death or marriage of, or the formation of a civil partnership by, the original lessee or the survivor of the original lessees, by at least one month’s notice in writing given to determine the same on one of the quarter days applicable to the tenancy, either by the lessor or the persons deriving title under him, to the person entitled to the leasehold interest, or if no such person is in existence by affixing the same to the premises, or by the lessee or other persons in whom the leasehold interest is vested to the lessor or the persons deriving title under him: