While our investigation found that Detective Chief Inspector Tagg should have been more forcible and clear in advising prosecution Counsel of the immunity issue, he did not intend to deceive in his evidence provided at Crown Court. We found no evidence to corroborate the assertion that DCI Tagg knew of or sanctioned the offer of immunity prior to it being given at a public meeting by DI Kiyani.
DCI Tagg may have told Counsel about the immunity issue, but on the basis he should have done so with greater clarity and conviction the IPCC recommended management intervention to remind him of his responsibilities as a senior investigating officer.
The murder investigation was a complex, high profile one and it was vital that it was carried out in a way that could command the confidence of all communities in Birmingham. While we cannot say what impact this issue had on the trial or the verdict, the bereaved families publicly placed their faith in the criminal justice system but they understandably feel that they have been failed by the system they trusted.