Before it shall be lawful for the company to make any greater deviation from the level than five feet, or, in any town, village, street, or land continuously built upon, two feet, after having obtained such consent as aforesaid, it shall be incumbent on the company to give notice of such intended deviation by public advertisement, inserted once at least in two newspapers, or twice at least in one newspaper, circulating in the district or neighbourhood where such deviation is intended to be made, three weeks at least before commencing to make such deviation; and it shall be lawful for the owner of any lands prejudicially affected thereby, at any time before the commencement of the making of such deviation, to apply to the Board of Trade, after giving ten days’ notice to the company, to decide whether, having regard to the interests of such applicants, such proposed deviation is proper to be made: and it shall be lawful for the Board of Trade, if they think fit, to decide such question accordingly, and by their certificate in writing either to disallow the making of such deviation, or to authorize the making thereof, either simply, or with any such modification as shall seem proper to the Board of Trade; and after any such certificate shall have been given by the Board of Trade it shall not be lawful for the company to make such deviation, except in conformity with such certificate.