More muddled thinking:
The report is publicly available and will thus be available to law enforcement agencies by default. It would be highly inappropriate to resrict access to that report.
The evidence in court would come from their investigation.
At that point it is up to the police or apropiate body to conduct their own investigation and decide if a prosecution is appropriate. The focus of their inquiries will inveitably come from the AAIB report, but with the crucial difference that the AAIB report is focused on safety.
Again advocating using a safety report not intended to identify blame or liability to make a decision on blame and liability.