It all depends on the certainty you get from tooth pit . If they got a genuine skull from the UK , and it has a formation of tooth holes that can literally be nothing but a big cat (no 95%, no 97% but 100%) then i think that is proof enough for me . Of course their is the angle of "maybe its a zoo skull used" but its impossible to be certain . I dont know how you could prove where its from , there will always be a angle for uncertainty.
Regardless of a breeding population which everyone seems to fixate on if their is big cats living in the UK then that major major news no matter how you c