Big cats in the UK

This is ,at least to me a much more realistic possibility than either Bigfoot or Nessie,that leopards can survive in much harsher conditions than  have existed in Britain, since the last ice age is proven by the Himalayan Snow leopard and the Siberian tiger,

But once again,the hard evidence has not been found,personally if such an animal does exist ,it is more likely to be a feral cat similar to the Scottish wildcat which does still exist in remote parts of Scotland.