ok so the smithfield collie blood was pre war and jeff has been adding to the strain ever since to keep the blood lines going if im not mistaken,the tumbler type of lurcher that come from these litters are a type with its own style as has been said.some one correct me if im wrong,but added to these lines has been deerhound greyhound,whippet,saluki,cumberlnd spaniel,huski different types of collie ie not bearded or border but to name a few,if you want one of thes pups they come at around 250-300 quid wich to a working man seems a little steep considering you would not know how it would throw.