s 4 Proof of instruments
Every document purporting to be an instrument made or issued by any Minister or authority or person under any provision contained in, or having effect under, Essential Regulations, and to be signed by or on behalf of the said Minister, authority or person, shall be received in evidence, and shall, until the contrary is proved, be deemed to be an instrument made or issued by that Minister, authority or person; and prima facie evidence of any such instrument as aforesaid may, in any legal proceedings, including arbitrations, be given by the production of a document purporting to be certified to be a true copy of the instrument by, or on behalf of, the Minister or other authority or person having power to make or issue the instrument.