Halden served as a Parliamentary Secretary assisting the Ministers for Education, and Parliamentary and Electoral Reform (20 November 1990 - 19 March 1991); and for Productivity and Labour Relations, and Consumer Affairs (from 19 March 1991) 30 April 1990 - 16 February 1993.
Deputy Leader of the Opposition in the Legislative Council 17 February 1993 - 30 November 1993; Leader of the Opposition from 30 November 1993 to 15 October 1996.