For my part, i like the idea of big cats in the uk, with the caveat that invasive non native species often have a negative impact on ecosystems, but the idea is nice, having said that the likelihood of the reality of a breeding population seems doubtful. Those that believe often state the retractors should prove their case but of course it is pretty impossible to prove something doesn't exist ie
(A) there's an alien in the corner,
(B) but i can't see him,
A) he's invisible to human eyes,
(B) but i cant feel him,
(A) his physical form inhabits another dimension.
et