Section 23 Conditions under which warranty may be used in defence.

the defendant has within seven days of the service of the summons sent to the prosecutor a copy of the warranty with a notice stating that he intends to rely on it and specifying the name and address of the person from whom he received it, and has also sent a like notice of his intention to that person;

in the case of a warranty given by a person resident outside the United Kingdom, the defendant proves that he had taken reasonable steps to ascertain, and did in fact believe in, the accuracy of the statement contained therein.