81For subsections (4) to (6) of section 2 of that Act (requirement of warning of prosecution: supplementary) there shall be substituted—
“(4)Failure to comply with the requirement of section 1(1) of this Act in relation to an offence is not a bar to the conviction of a person of that offence by virtue of the provisions of—
(a)section 24 of this Act, or
(b)any of the enactments mentioned in section 24(6);
but a person is not to be convicted of an offence by virtue of any of those provisions if section 1 applies to the offence with which he was charged and the requirement of section 1(1) was not satisfied in relation to the offence charged.”