“12. It was argued by Mr. Megaw, though not very strenuously, that even if the sanction was defective, the defect could be cured under the provisions of Section 537, Criminal P. C., which provides, so far as material, that no finding, sentence or order passed by a Court of competent jurisdiction shall be altered or reversed on account of any error, omission or irregularity in any proceedings before or during the trial, unless such error, omission or irregularity, has, in fact, occasioned a failure of justice. It was not disputed that if the sanction was invalid the trial Court was not a Court of competent jurisdiction, but Mr. Megaw contends that there was in this case a sanction, and that the failure of the Crown to prove the facts on which the sanction was granted amounted to no more than an irregularity. Their Lordships are unable to accept this view. For the reasons above expressed the sanction given was not such a