It's probably an escaped "Big Cat". Lots of evidence in Ayrshire of one(a big black un too).
Seen by 2 local bobbies in Saltcoats/Ardrossan area a few years back, I was also told by reliable witness that he'd found a half a deer one day. He'd then tied it up a tree with a rope with the intent to grab the car and retrieve it later, on returning the deer was gone and parts of the rope that were left behind were snapped rather than cut and this was just outside of Ayr.
And occasionaly you see unexplainable tracks (one recently larger than the size of my fist) was quite hard to get an positive ID as it was atleast a day or 2 old but it had literally jumped out to me as it was so big and measured nearly twice the size of the largest dog print in the area in width and a good bit longer in length, there was also deer tracks in the same area and going in the same direction and very deep as if it had been moving fast and from my limited tracking knowledge, the same age. But my tracking skills as I said are limited and it could of been a coincidence and just a false print I took to be something it was'nt.
The U.K. does seem to have it's fair share of big cats, They are more likely illegally kept play things & when the " owners" are fed up with them or unable to control them they are disposed of i.e. dumped in the countryside.........Escaped animals from zoos, circuses or private collections are usually recaptured soon after the event. There must also be continuous releases as some of thes" beasts" have been roaming fo over 30 years & no big cat lives that long.