Big cat spotted in England

There have indeed been many sightings of Big Cats in the UK, for as long as I can remember, but this is the first I've heard of them being referred to as "Alien Big Cats". The article you cite does not refer to them as alien either. Did you just add the "alien" part yourself or do you mean alien to that particular environment and not alien as in ET?

I have personally seen a big cat outside a McDonalds in Yorkshire. It asked me in a polish accent 'I can has cheese burger'

Due to the content and meaning of the article, I'm fairely sure they mean "Alien" as a foreign/unknown animal in a enviroment it does not belong in, or have not previously been successfully documented. But wern't it another rather big article about these cats a month or two back with a brittish forestkeeper or so that saw one or two?

"Alien big cats" in this context usually means not where you'd expect to find them, not necessarily extraterrestrial. It also makes a handy acronym, ABC. There's loads round our way. From our local community maghazine recently: "If you wake before dawn and walk up the Old Roman Road, you may well see this panther-like cat crossing your path, and head across the fields behind Elwell St - black and sleek, its long tail straight out behind, picking its silent way on wide, black pads. In the early morning it is possibly returning after a night's hunting, the occasional chicken suffering deep claw ... [More]