attendance and carry out the examination of witnesses to testify on his behalf before the court on the same conditions as those applying to witnesses called by the prosecution; and (f) shall be permitted to have without payment the assistance of an interpreter if he cannot understand the language used at the trial of the charge, and except with his own consent the trial shall not take place in his absence unless he so conducts himself as to render the continuance of the proceedings in his presence impracticable and the court has ordered him to be removed and the trial to proceed in his absence. (3) When a person is tried for any criminal offence, the accused person or any person authorised by him in that behalf shall, if he so requires and subject to payment of such reasonable fee as may be prescribed by law, be given within a reasonable time after judgement a copy for the use of the accused person of any record of the proceedings made by or on behalf of the court. (4) No person shall be held to be guilty of a criminal offence on account of any act or omission that did not, at the time it took place, constitute such an offence, and no penalty shall be imposed for a criminal offence that is severer in degree or description than the maximum penalty that might have been imposed for that offence at the time when it was committed. (5) No person who shows that he has been tried by a competent court for a criminal offence and either convicted or acquitted shall be tried again for that offence or for any other criminal offence of which he could have been convicted at the trial for that offence, save upon the order of a superior court in the course of appeal or review proceedings relating to the conviction or acquittal.