If any difficulty arises in giving effect to the provisions of this Act, the Central Government may, by order, do anything not inconsistent with such provisions, which appears to it to be necessary or expedient for the purpose of removing the difficulty:
     Provided that no such order shall, in relation to any metropolitan city, be made after the expiry of a period of two years from the date on which this Act applies or is made applicable to such metropolitan city under sub-section (3) of section 1.