(3) Where land included in a town planning scheme is in the area of more than one local authority, or is in the area of a local authority by whom the scheme was not prepared, the responsible authority may be one of those local authorities, or for certain purposes of the scheme one local authority and for certain purposes another local authority, or a joint body constituted specially for the purpose by the scheme, and all necessary provisions may be made by the scheme for constituting the joint body and giving them the necessary powers and duties : Provided that, except with the consent of the London County Council, no other local authority shall, as respects any land in the county of London, prepare or be responsible for enforcing the observance of a town planning scheme under this Part of this Act, or for the execution of any works which under the scheme or this Part of this Act are to be executed by a local authority.

56 (1) The Local Government Board may make regu- lations for regulating generally the procedure to be adopted with respect to applications for authority to prepare or Procedure adopt a town planning.

Scheme, the preparation of the of the scheme, obtaining the approval of the Board to a scheme emmeS v " so P re P are or adopted, and any inquiries, reports, notices, Board or other matters required in connection with the prepara- tion or adoption or the approval of the scheme or pre- liminary thereto, or in relation to the carrying out of the scheme or enforcing the observance of the provisions thereof.

(2) Provision shall be made by those regulations (a) for securing co-operation on the part of the local authority with the owners and other persons inter- ested in the land proposed to be included in the scheme at every stage of the proceedings, by means of conferences and such other means as may be provided by the regulations ; (6) for securing that notice of the proposal to prepare or adopt the scheme should be given at the earliest stage possible to any council interested in the land; and (c) for dealing with the other matters mentioned in the Fifth Schedule to this Act.

(1) The responsible authority may at any time, scheme a f er giving such notice as may be provided by a town planning scheme and in accordance with the provisions of the scheme (a) remove, pull down, or alter any building or other work in the area included in the scheme which is such as to contravene the scheme, or in the erection or carrying out of which any provision of the scheme has not been complied with ; or (b) execute any work which it is the duty of any person to execute under the scheme in any case where it appears to the authority that delay in the execution of the work would prejudice the efficient operation of the scheme.