(1) Every competent authority other than the Board of Trade shall forthwith upon the receipt by them of the periodical or other estimates and returns furnished to them under this Act transmit to the Board of Trade copies of such estimates and returns.
(2) If it shall appear to the Board of Trade that the information contained in the copies so transmitted is insufficient for the purpose of the discharge by them of the functions imposed upon them by Subsection (1) of Section (2) of this Act the Board of Trade shall require any person to whom Subsection (2) of the said section applies to furnish such returns as may be required for providing the additional information required for the discharge of the said functions, but save as aforesaid no person shall be required to furnish to the Board of Trade any information which has been required by any other competent authority to be furnished to such authority:
