For the removal of doubts, it is hereby declared that all rules made under section 3 of the principal Act and in force immediately before the 21st March, 1964, shall continue to be in force after that date until amended, varied or rescinded, as if such rules were made under the principal Act as amended by this Act; and any action taken (including appointments made) in pursuance of those rules on or after the 21st March, 1964 and before the commencement of this Act shall be as valid and operative as if it had been taken in accordance with low.