Notwithstanding anything in F1section 136 of the Criminal Procedure (Scotland) Act 1995, summary proceedings in Scotland for an offence under this Act may be begun at any time within six months after the date on which evidence sufficient in the Lord Advocate’s opinion to justify the proceedings came to his knowledge.

For this purpose a certificate of the Lord Advocate as to the date on which such evidence came to his knowledge is conclusive evidence.

For the purposes of subsection (1) and of any other provision of this Act as to the time within which summary proceedings for an offence may be brought, proceedings in Scotland shall be deemed to be begun on the date on which a warrant to apprehend or to cite the accused is granted, if such warrant is executed without undue delay.