CHAPTER 1
Fundamental rights
Article 15
2. Anyone who has been deprived of his liberty other than by order of a court may request a court to order his release. In such a case he shall be heard by the court within a period to be laid down by Act of Parliament. The court shall order his immediate release if it considers the deprivation of liberty to be unlawful.
Rights during investigation - not to be subjected to any form of coercion, duress or threat, to torture or to any other form of cruel, inhuman or degrading treatment or punishment
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.