Emins Nova Constitutio Futuris Forma Imponere debet, et non Praeteritio

West Pakistan Urban Rent Restriction Ordinance (VI of 1959), Ss. 4, 5, 6 (1) (c) & 8-Clause (c) of S. 6 (1) as added by West Pakistan Urban Rent Restriction (Amendment) Ordinance (XXI of 1965), not retrospective in effect-Does not affect applications for fair rent pending on date of coming into force of Ordinance (XXI of 1965)-Cases to which cl. (c) not attracted-Tenant not entitled in such cases to refund of excess over fair rent (fixed by Controller) recovered by landlord-Ordinance (VI of 1959) does not prohibit parties' agreeing to any amount of rent unless fair rent is fixed under S. 4 of Ordinance (VI of 1959)-Interpretation of statutes-Procedural amendment affects pending proceedings Amendments affecting rights of individuals do not affect such proceedings-Right to receive rent a substantive right-No one has any vested right in matters of procedure-Maxim: Emins nova constitutio futuris forma imponere debet, et non praeteritio.