I don't think so- I think this is normal pale gray colouration found on inner legs and face, rather than domestic-type 'white' markings. Also look at the tail tip- it is truncated (blunt) which is a hallmark of a genuine wildcat.
Somewhere on the Twycross gallery are photos of their wildcats showing their tail tips- pointed which is usually a sign of domestic blood (whatever they say about them being 'pure'!)
Unfortunatly according to a person who works with Scottish Wildcats in the wild if the tips of the legs are white then sadly it has some domestic cat in the blood line the legs should be of a brown configuration ie; thorn, light brown or brown with black or darker brown marking just showing through.
The lack of any of the above makes my friend think that there is definatly some domestic cat inj this one.
You are quite right about the tail but again this as occured to many times in wildcat/domestic breeding over the years to be 100% accurate.
Sadly I think not enough British Zoos help try to keep this our ONLY wildcat from becoming very dangerously endangered imagine if this had been 3 times as big and came from a far off country then every zoo in the UK would want a pure pair.
Sometime it makes me wonder if the zoos are actually into saving endangered species or are they just after major publicity
