I'm sure research was done on museum specimens of both. I know it has been done on Scottish cats, with emphasis on historical specimens that were believed to be purer before hybridisation took hold. But I think they found evidence of some hybridisation even going back hundreds of years. I believe there is still difference of opinion as to how close grampia and sylvestris really are though. It may only be considered as a distinction at race level now, but if European cats are introduced to bolster the Scottish population, then the original grampia race will eventually be lost for good, even if any pure specimens do still exist in remote areas where they haven't even been looked for yet. The other alternative is the release of near-pure cats from the captive programme-which is frequently mentioned as being the plan. These cats would be grampia with some (low) hybrid content. I am unclear whether the intention is to release both types though it appears that way at present.