I'm sure a lot of the sightings are spurious - but I seem to remember a documentary thing, years ago, presented by the Tomorrows World presenter Maggie Philbin(?) about the sightings in Scotland where they actually caught one, which turned out to be a domestic cat / scottish wildcat cross, and was larger than either species (german shepherd size?) and black and female - and for some reason didn't live long in captivity.
Does anyone else remember that or am I imagining things?
mab