Hi Colin,
Your screen name says it all!
Welcome to the frustrating world of cobras in NSW. You need to get in contact with Treeve Andrew. He is an engineering signatory who takes the time to read and understand the legislation and is fed up with the constant battles placed on his business by the state authority.
Treeve is also probably the most knowledgable engineer on the panel and actually certifies cars properly. However, still has difficulties.
His details.
Kernow Engineering