A committee of Her Majesty's Most Honourable Privy Council, consisting of the Lord Chancellor of Great Britain for the time being, the Lord Privy Seal for the time being, and one of Her Majesty's Principal Secretaries of State (in this Act referred to as the Committee of Council), acting in case of difference according to the opinion of any two of them, may from time to time direct impressions with the same device as the Great Seal and of the Privy Seal to be taken in such manner and of such size or sizes as they may from time to time prescribe, on embossed paper, wax, wafer, or any other material; and any such impressions, in this Act respectively called a Wafer Great Seal and a Wafer Privy Seal, shall be in the same custody as the seals of which they are impressions, and when attached to or embossed on any document required to be or usually authenticated by or passed under the Great Seal or Privy Seal shall confer on that document the same validity in all respects as if the document itself had been authenticated by or passed under the Great Seal or Privy Seal.