Section 78(6) of the [1993 c. 36.] Criminal Justice Act 1993 (application of Act to pre-commencement offences) shall have effect, and be deemed always to have had effect, with the substitution, for the words from “or the powers” to the end, of the words “and, where it confers a power on the court, shall not apply in proceedings instituted before the coming into force of that provision.”.