3Notwithstanding any rule of law to the contrary, a person ordered to be retried under section 6 of this Act may, if found guilty, be convicted on the retrial and the court before whom he is so convicted may pass in respect of the offence of which he is so convicted any sentence authorised by law to be imposed upon a conviction for that offence.
4Without prejudice to the power of the court to impose any other sentence, the court before whom a person is convicted on retrial may pass in respect of the offence any sentence lawfully passed in respect of the offence charged on the original conviction notwithstanding that, on the date of the conviction on retrial, that person has ceased to be of an age at which such a sentence could otherwise be passed.
5Where the person convicted on retrial is sentenced to imprisonment or other detention, the sentence shall begin to run from the time when such a sentence passed at the original trial would have begun to run ; but, in computing the term of his sentence or the period for which he may be detained thereunder, as the case may be, there shall be disregarded—
(a)any time before his conviction on retrial which would have been disregarded if the sentence had been passed at the original trial and the original conviction had not been quashed; or
(b)any time during which he was at large after being admitted to bail under section 17 of this Act.