Wales' Independent Police Complaints Commissioner has published an overview of his supervision of the police investigation into the Lynette White miscarriage of justice investigation.
Tom Davies says lessons have been learnt from the "groundbreaking investigation" which will guide future investigations into serious misconduct.
Lawyers for the three men wrongly convicted of the murder of Lynette White in 1988 say the Home Office has confirmed they won't hold a public inquiry into the handling of the police corruption trial that followed.
Lynette White was working as a prostitute in Cardiff Bay when she was stabbed to death on Valentine's Day in 1988.
The wrongful conviction of three men, the so-called 'Cardiff Three', led to a failed police corruption case in 2011.
In a statement today The Home Office said: '“The Home Secretary has decided there should be no further inquiry or review at this stage into the matters surrounding the collapse of the 2011 trial.
“The Home Secretary will review her decision upon the completion of a related investigation being undertaken by Devon and Cornwall Police on behalf of South Wales Police.”
A South Wales Police spokesperson says the force is continuing to help the CPS and IPCC investigation into circumstances that led to the collapse of the trial of eight officers involved in the Lynette White murder investigation.