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1 If the Commission receives a complaint made in accordance with this paragraph of failure by a public authority to comply with a scheme approved or made under paragraph 6 or 7, it shall— a investigate the complaint; or b give the complainant reasons for not investigating. 2 A complaint must be made in writing by a person who claims to have been directly affected by the failure. 3 A complaint must be sent to the Commission during the period of 12 months starting with the day on which the complainant first knew of the matters alleged. 4 Before making a complaint the complainant must— a bring the complaint to the notice of the public authority; and b give the public authority a reasonable opportunity to respond.