Didn't casa set up some accident investigation group around 2008. Remember some article on the group that were being trained in the US or Cranfield UK. Probably the directors newsletter. What was the purpose - surely to investigate?
Found the reference in the annual report
Civil Aviation Safety Authority - Stakeholder liaison
Complementing activities under the MoU, in 2008–09 CASA established an Accident Liaison and Investigation Unit to manage the agencies’ day-to-day interaction. The unit provides a contact point for the ATSB, reviews all ATSB occurrence reports and prepares responses to ATSB recommendations, and identifies opportunities for aviation safety improvement.
CASA has also established an Accident Investigation Report Review Committee, chaired by the Deputy Director of Aviation Safety, to review and agree on the method of implementation of any formal recommendations from the ATSB.