Where a local authority in England has made a smoke control order under section 18 of the Clean Air Act 1993, any limitations or exemptions from the operation of section 20 of that Act (prohibition of emissions of smoke) made by that order under section 18(2)(b) or (c) of that Act that apply immediately before the commencement of Parts 1 and 3 of this Schedule continue to apply as if they were limitations or exemptions from the operation of Schedule 1A to that Act (penalty for emission of smoke), as inserted by paragraph 3 of this Schedule.