5. Where the officials of and other accompanying persons authorised or appointed by the ECB find that a person opposes an inspection ordered pursuant to this Article, the national competent authority of the participating Member State concerned shall afford them the necessary assistance in accordance with national law. To the extent necessary for the inspection, this assistance shall include the sealing of any business premises and books or records. Where that power is not available to the national competent authority concerned, it shall use its powers to request the necessary assistance of other national authorities.