Not going to be easy Tengu; the Wildcat is a dawn and dusk hunter, generally solitary and it blends beautifully into it's preferred forest habitat.
There are a couple in wildlife parks though, maybe not ideal but at least that way you'd know what you were looking for.
It's a bonnie beast, big, hefty looking with a thicker tail than the common moggie, black rings around the tail and the ears sit kind of flat (as though it's listening sideways and behind, anyone who has a cat will know what I mean
)
Surely we can find links to parks that hold them, I know there's supposedly a captive breeding programme, which is awkward because unlike domestic cats they have a breeding season, something to do with them being native and the housecat being brought in around the time of the Romans to be pets and protect granaries from mice; Brits buried their grain in cists and the like.
Never mind the wolf, bring back the cats, the lynx was native here too
cheers,
Toddy