5(1)Every document purporting to be an order or other instrument issued by the Commissioners and to be sealed with the seal of the Commissioners authenticated in manner provided by paragraph 4(2) above, or to be signed by the secretary to the Commissioners or any person authorised by the Commissioners to act on behalf of the secretary, shall be received in evidence and be deemed to be such order or instrument without further proof, unless the contrary is shown.
(2)The [1868 c. 37.] Documentary Evidence Act 1868, as amended by the [1882 c. 9.] Documentary Evidence Act 1882, shall apply to the Commissioners as though the Commissioners were included in the first column of the Schedule to the said Act of 1868, and the chairman or any other Commissioner, or the secretary, or any person authorised to act on behalf of the secretary, were mentioned in the second column of that Schedule, and as if the regulations referred to in those Acts included any document issued by the Commissioners.