reg 40 Amendment of charges
(1) Where in preliminary proceedings (whether before or after arraignment) or trial proceedings it appears to the court that the charge sheet or any charge is defective, it shall make such order for the amendment of the charge sheet or charge (as the case may be) as appears necessary to meet the circumstances of the case. (2) But the court may not make an order under this rule if, in all the circumstances, the required amendments cannot be made without injustice. (3) Without prejudice to the generality of paragraph (2), in relation to a proposed amendment in preliminary proceedings the circumstances relevant for the purposes of that paragraph include (in particular) whether the defendant has been arraingned. (4) Where an order is made under this rule, the Director shall serve the amended charge sheet on every defendant in the way that would be required by regulations made under section 128— (a) if the amendment had been made otherwise than in accordance with an order made under this rule; and (b) where the amendment is made after arraignment, if it had been made before arraingnment.