7. Where there is a chain of landlords, this notice must be given by the landlord who is designated as “the reversioner” (see paragraphs 1 and 2 of Schedule 1 to the Act). For this purpose the reversioner is either the landlord whose tenancy carries an expectation of possession of the house and premises of 30 years or more after the expiration of all the inferior tenancies (or, if there is more than one such landlord, the one whose tenancy is nearest to that of the tenant) or, if there is no such landlord, the freeholder.