CIVIL LAW — plaintiff claims entitlement to both worker's compensation and damages — plaintiff suffered injury after attending State Emergency Service conference — paid compensation by WorkCover as a result of injury under Workers Compensation (Bush Fire, Emergency and Rescue Services) Act 1987 — also sued State Emergency Service for damages in negligence — claim settled — insurer for the defendant paid to Workcover from the settlement money the amount the plaintiff had received in compensation — whether WorkCover and the State of NSW both the Crown — interpretation of s 151Z Workers Compensation Act 1987 — identity of "person other than the worker's employer" liable to pay damages in respect of an injury