“… of primary fact, but also to the evaluation of those facts and to inferences to be drawn from them. The best known of these cases are: Biogen Inc v Medeva Plc [1997] R.P.C. 1; Piglowska v Piglowski [1999] 1 W.L.R. 1360; Datec Electronics Holdings Ltd v United Parcels Service Ltd [2007] UKHL 23; [2007] 1 W.L.R. 1325 ; Re B (A Child) …”