4. Member States shall ensure that a person referred to in paragraph 1 has access to a court or another independent and impartial public body competent to review the procedural and substantive legality of the competent authority’s decisions, acts or failure to act under this Regulation, without prejudice to any provisions of national law which require that administrative review procedures be exhausted prior to recourse to judicial proceedings. Those review procedures shall be fair, equitable, timely and not prohibitively expensive, and shall provide adequate and effective remedies, including injunctive relief where necessary.