As the Court said in R -v- Cartwright (1989) 17 NSWLR 243 at 252:
"It is clearly in the public interest that offenders should be encouraged to supply information to authorities which will assist them in bringing other offenders to justice and to give evidence against those offenders in relation to whom they have given such information. In order to ensure that such encouragement is given an appropriate reward for providing assistance should be granted…..The information which he gives must be such as could significantly assist the authorities. The information must of course be true."
There is nothing before this Court that when the offender gave evidence he did not do it truthfully. In the first instance his involvement in proceedings against an accused person resulted in a conviction. That the conviction was overturned on appeal where, so I believe, the offender was not required to give viva voce evidence, does not detract from his contribution on behalf of authorities.