be made so as to apply only in relation to proceedings instituted in specified areas, or proceedings of, or against persons of, specified classes or descriptions;

make different provision with respect to proceedings instituted in different areas, or different provision with respect to proceedings of, or against persons of, different classes or descriptions; and

make such transitional provision in relation to proceedings instituted before the commencement of any provision of the regulations, or in relation to a stage begun before that commencement, as the Secretary of State considers appropriate.