Sch 8 para 4
(1) A reference to a Planning Inquiry Commission of a proposal that development should be carried out by or on behalf of a government department may be made at any time. (2) A reference of any other matter mentioned in section 101 may be made at any time before, but not after, the determination of the relevant application referred under section 77 or the relevant appeal under section 78 or, as the case may be, the giving of the relevant direction under section 90(1). (3) The fact that an inquiry or other hearing has been held into a proposal by a person appointed by any Minister for the purpose shall not prevent a reference of the proposal to a Planning Inquiry Commission. (4) Notice of the making of a reference to any such commission shall be published in the prescribed manner. (5) A copy of the notice must be served on the local planning authority for the area in which it is proposed that the relevant development will be carried out, and— (a) in the case of an application for planning permission referred under section 77 or an appeal under section 78, on the applicant and any person who has made representations relating to the subject matter of the application or appeal which the authority are required to take into account under any provision of a development order made by virtue of section 71(2)(a) ; (b) in the case of a proposal that a direction should be given under section 90(1) with respect to any development, on the local authority or National Park authority or statutory undertakers applying for authorisation to carry out that development. (6) Subject to the provisions of this paragraph and paragraph 5 and to any directions given to them by the responsible Minister or Ministers, a Planning Inquiry Commission shall have power to regulate their own procedure.