For the purposes of the matters dealt with in sections nine to fifteen of this Act or any of those matters, registration in the register of disabled persons maintained under the United Kingdom Act shall be treated as having the same effect as registration in the register of disabled persons maintained under this Act:
Provided that the provision made by this section shall not have effect during any period occurring after the passing of this Act in which registration in the register of disabled persons maintained under this Act is not treated, pursuant to sub-section (4) of section twenty-two of the United Kingdom Act, as having, for the purposes of the matters dealt with in sections nine to fifteen of the United Kingdom Act or any of those matters, the same effect as registration under that Act.