6U.K.Minutes of the proceedings of the Commissioners or of the Board signed at the same or the next meeting by a member describing himself, or appearing to be, the person presiding at the meeting at which the minutes are signed, shall be received in evidence without further proof, and, until the contrary is proved, every meeting of the Commissioners or of the Board, in respect of the proceedings whereof minutes have been so signed shall be deemed to have been duly convened and held.