law: General Clauses Act, 1897
  17. Substitution of functionaries
  (1) In any 12[Central Act] or Regulation, made after the
  
  commencement of this Act, it shall be sufficient, for the purpose of indicating
  
  the application of a law to every person or number of persons for the time
  
  being executing the function of an office, to mention the official title of the
  
  officer at present executing the functions, or that of the officer by whom the
  
  functions are commonly executed.
  (2) This section applies also to all 12[Central Acts] made after
  
  the third day of January, 1868, and to all Regulations made on or after the
  
  fourteenth day of January, 1887.