I think it's safe to say that, even if I did spot a Scottish Wildcat in its natural habitat, I would not know if I was actually seeing a wildcat or a domestic.
Here is a photo of a Scottish Wildcat, taken at the Highland Wildlife Park in Kingussie. It had a little kitten but it was hiding inside a wee den so I couldn't get a shot of it.
It is estimated that there are only 400 wildcats left in their natural environment in Scotland.