43 In support of this ground, Mr Spence drew attention to the provisions of the Act, s33(1) which provides that a person may request a planning authority to amend a planning scheme and s33(2A) which renders the request ineffective unless it is made by the owner of the land, or the owner of the land consents to the request being made. If the matter rested there, there would be some substance to Mr Spence's submission, but the Act, s34(1)(b) empowers a planning authority to initiate an amendment to the scheme of its own motion. Indeed, it is a fundamental responsibility of a planning authority to be proactive in the administration of its planning scheme and to initiate appropriate amendments from time to time to suit the changing needs of the community. Regardless of whether a proposed amendment owes its origin to a request from a land owner or the initiative of a planning authority, it still has to be certified suitable for public exhibition, put on public exhibition and the public is entitled to make representations to the Council with respect to it. As has been noted earlier, the Council is obliged to report to the Commission at the end of the period of public exhibition and the Commission required to hold a hearing as enacted by the Act, s40. These are precisely the procedures that must be followed in the case of an alteration to a substantial degree of a draft amendment. By directing that other land be included in the draft amendment and declaring an alteration to a substantial degree, no more was done than could have been done by the Council when it initiated the amendment in the first place. Without deciding, as it is unnecessary to do so, I would venture to suggest that any change to a draft amendment required by the Commission that involved land other than that in respect of which the owner's consent had been given, would constitute an alteration to a substantial degree.