1N.I.In this Schedule the following expressions have the meanings hereby assigned to them in relation to a tenancy (in this Schedule referred to as “the relevant tenancy” ), that is to say:—
“the competent landlord” means the person who in relation to the tenancy is for the time being the landlord (as defined by section 28) for the purposes of Part I;
“mesne landlord” means a tenant whose interest is intermediate between the relevant tenancy and the interest of the competent landlord; and
“superior landlord” means a person whose interest is superior to the interest of the competent landlord.