22. Notwithstanding anything contained in any other law for the time being in force or in any contract, where the conditions referred to in clauses (1), (2), (3), (4) or (5) of section 7 or section 10 are fulfilled in relation to the tenancy of an under-tenant or where any non-agricultural land is held by an under-tenant under a lease in writing for a term of not less than twelve years specified in such lease, such under-tenant shall have as regards his immediate landlord all the rights and liabilities of a tenant as set forth in section 7, section 8 or section 10, as the case may be, and the provisions of section 6 shall apply, and the provisions of section 20, in so far as they are inconsistent with the provisions of this section, shall not apply, to such under-tenant.