PRACTICE AND PROCEDURE — application for separate trial (r 28.2 Uniform Civil Procedure Rules 2005 (NSW)) as to whether the plaintiff was a “worker or deemed worker by reason of the Workplace Injury Management and Workers Compensation Act 1998 and/or the Workers Compensation Act 1987” — criteria for ordering a separate trial of issues, contrary to the general practice of determining all issues at the same time — absence of agreed facts — issue not suited to severability — application for separate trial refused