120.—(1) A document purporting to be, or to contain, an order, direction or certificate issued by the Secretary of State or the Welsh Ministers must be received in evidence and taken to be or to contain (as the case may be) that order, direction or certificate without further proof, unless the contrary is shown.
(2) Paragraph (1) applies whether the document is signed by—
(a)the Secretary of State personally or on behalf of the Secretary of State; or
(b)a Welsh Minister personally or on behalf of a Welsh Minister.
(3) Without prejudice to paragraph (1), a certificate signed by or on behalf of the Secretary of State or the Welsh Ministers confirming—
(a)the making of an order,
(b)the issuing of a document, or
(c)the exercise of a discretion, power or obligation arising or imposed under the Insolvency Act, the Water Industry Act 1991 or these Rules,
is conclusive evidence of the matters dealt with in the certificate.