The failure to disclose that a witness who gave evidence at a murder trial was seeking registration as a police informant did not affect the fairness of the trial so as to render the subsequent conviction unsafe. The circumstantial case was compelling, and even with full and proper disclosure the task of assessing the reliability of the witness would have changed neither the landscape of the trial nor the jury's deliberations upon the evidence.

CA (Crim Div) (Pitchford LJ, Andrew Smith J, Popplewell J) 18/1/2012
[2012] EWCA Crim 5