16The repeal by this Act of subsections (2) to (4) of section 30 of the [1968 c. 29.] Trade Descriptions Act 1968 shall not affect the operation of those subsections in their application to any case where a notice under subsection (2) of that section, or a certificate under subsection (4) of that section or a document purporting to be such a certificate, has been given or issued before the commencement of this Act; and the duty imposed by section 130(1) of this Act shall not apply where such a notice has been so given.