EWCA Crim 3443
References to "purity" within advice given by the Sentencing Advisory Panel to the Court of Appeal and by the Court of Appeal itself in R. v Mashaollahi (Behrooz)  1 Cr. App. R. 6 were references to the question of whether there had been any contamination or adulteration of the opium consignment, and not to the percentage content of the active ingredient morphine.
CA (Crim Div) (Latham LJ (VP CA Crim), Cooke J, Cranston J)