http://www.legislation.gov.uk/apni/1964/36/section/46Business Tenancies Act (Northern Ireland) 1964An Act to provide security of tenure for certain tenants occupying premises for business, professional or certain other purposes by enabling them to obtain new tenancies in certain cases or in certain circumstances to obtain compensation; to make provision for the payment of compensation in respect of certain improvements to such premises; and for purposes connected therewith.texttext/xmlenStatute Law Database2013-02-182009-10-01 PART II46In this Part—“improvement order” has the meaning assigned to it by section 36(3);“notice of improvement” has the meaning assigned to it by section 34(1);“notice of objection” has the meaning assigned to it by section 34(2);“notice of undertaking” has the meaning assigned to it by section 34(2).