2SDuring any period—
(a)after the date of the coming into force of the provision of section 1(1) of this Act inserting into the principal Act the provision which becomes paragraph (d) of section 28A(3) of that Act; but
(b)before the date when section 4 of this Act comes into force,
there shall be substituted for the said paragraph (d) the following paragraph—
“(d)if the specified school is a special school and the child has not been ascertained as requiring special education;”.