Price Exploitation Prevention Act 1949

In any prosecution for an offence against this Act, a certificate under the hand of any person that a document annexed to the certificate is a true copy of a letter or notice sent by that person to the defendant shall be prima facie evidence of the matters certified to and that the original letter or notice of which the document purports to be a copy was received by the defendant on or about the time at which it would be delivered in the ordinary course of post if it had been sent on the date borne by the document, and that the signature on the certificate is the signature of the person by whom it purports to have been signed.