In the application of the provisions of this Part of this Act and of the Third, Fourth and Fifth Schedules to this Act that relate to the valuation of holdings, to registration or rectification of the register under the Registration Act, or to the preparation of leases or other instruments or of lease consolidation schemes, to a case in which a person, by or to whom any notice is required or authorised to be given, information furnished, or other act or thing done for the purposes of proceedings under those provisions, dies or is or becomes otherwise unable to act, references in those provisions to that person shall be construed as including references to a person substituted for that person in accordance with rules made by the Board of Trade.