http://www.legislation.gov.uk/apni/1964/36/section/35Business 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 II35Where a tenant has served a notice of improvement under section 34(1) on his landlord and that landlord has not within three months after such service, served on that tenant a notice of undertaking in respect of that notice of improvement and neither the landlord nor any superior landlord has, within such three months, or such longer period as may be permitted under section 44, served on the tenant a notice of objection in respect of the notice of improvement, such landlord and such superior landlord shall be deemed to have consented to the improvement specified in the notice of improvement and the tenant shall be entitled to execute the improvement in accordance in all respects with the plan and specification contained in that notice of improvement.