R v. Iain Davis [2008] UKHL 36
Landmark ruling on the use of anonymous witnesses in Criminal trials. The original case involved a double-murder perpetrated by the use of a handgun. The sole and decisive evidence came by way of witnesses who had had their identities hidden from the defendant and their evidence came from behind screens with their voices distorted to avoid recognition. The House of Lords agreed that the defendant could not have a fair trial in these circumstances and that he was entitled to know who his accusers were.