640.—(1) When the Commissioners of Northern Lighthouses or the Commissioners of Irish Lights propose to exercise any of their lighthouse powers, they shall submit a scheme to the Trinity House specifying the mode in which they propose to exercise the power, and their reasons for wishing to exercise the same, and they shall not exercise any such power until they have so submitted a scheme to the Trinity House and obtained the sanction of the Board of Trade in manner provided by this Act.

(2) The Trinity House shall take into consideration any scheme so submitted to them, and shall make a report, stating their approval or rejection of the scheme with or without modification, and shall send a copy of the report to the Commissioners by whom the scheme is submitted.

(3) For the purpose of obtaining the sanction of the Board of Trade to any scheme so submitted to the Trinity House, the Trinity House shall send a copy of the scheme and of their report thereon, and of any communications which have passed with reference thereto between them and the Commissioners by whom the scheme is submitted, to the Board of Trade, and that Board may give any directions they think fit with reference to the scheme, and may grant or withhold their sanction either wholly or subject to any conditions or modifications they think fit.

(4) The Commissioners by whom a scheme is submitted may, before a decision on the scheme is given by the Board of Trade, forward either to that Board or to the Trinity House any suggestions or observations with respect to the scheme or the report of the Trinity House thereon, and the Board of Trade in giving any decision on the scheme shall consider those suggestions or observations.

(5) The decision of the Board of Trade with reference to any scheme shall be communicated by that Board to the Trinity House, and by the Trinity House to the Commissioners by whom the scheme is submitted, and those Commissioners shall act in conformity with the decision.