Any person who refuses or wilfully neglects to attend in obedience to a notice issued under paragraph 3 above, or who wilfully alters, suppresses, conceals, destroys or refuses to produce any book or document which he may be required to produce by any such notice, or who refuses or wilfully neglects to comply with any requirement of the person appointed to hold the inquiry under paragraph 3 above, shall be liable on summary conviction to a fine not exceeding £20 or to imprisonment for a period not exceeding three months.