(1) New sections 578 and 579 apply to a proceeding for an offence committed before the commencement if a proceeding for the offence has not been finally dealt with before the commencement.
(2) If a proceeding for the offence has started, but has not been finally dealt with, before the commencement, the proceeding may be continued if it was started—(a) by a person who may start the proceeding under new section 578 or 579; and(b) within the period within which the person may bring a proceeding for the offence under new section 578 or 579.