The enactments specified in the Sixth Schedule to this Act are hereby repealed to the extent specified in the third column of that Schedule:
Provided that the repeals specified in Part II of that Schedule shall not have effect for the purposes of any period before the first day of April, nineteen hundred and fifty-nine; and the repeals specified in Part III of that Schedule shall not have effect for the purposes of any period before the sixteenth day of May nineteen hundred and fifty-nine.