Certification of instruments
18.—(1) A certificate signed by the First Secretary of State that any instrument purporting to be made or issued by—
(a)the First Secretary of State,
(b)the Secretary of State for Transport, Local Government and the Regions,
(c)the Secretary of State for the Environment, Transport and the Regions,
(d)the Secretary of State for the Environment, or
(e)the Secretary of State for Transport,
was so made or issued shall be conclusive evidence of that fact.
(2) A certificate signed by the Secretary of State for Transport that any instrument purporting to be made or issued by—
(a)the Secretary of State for Transport,
(b)the Secretary of State for Transport, Local Government and the Regions, or
(c)the Secretary of State for the Environment, Transport and the Regions,
was so made or issued shall be conclusive evidence of that fact.