Thank you for the clarification. I was playing devils advocate to some extent. Oxfordshire, and especificaly the rail line between Charlbury and Oxford is a bit of a hot spot for big cats. Saying that they are notoriously difficult to track, they can easily travel 30-40km in a day within their range and are masters of camouflage. The Oxfordshire Big Cats do well on game, muntjack, partridge, pheasant, pigeon, rabbits, ducks etc. occasionally during severe weather they take livestock. Their kills are very efficient, usually, on larger game, a single spinal puncture on the neck and claw punctures in the rib/chest area. Large prey is then eaten from the hind area forward. Bird kill areas are generally neat.
The UK big cats form the group of animals which may have been pets and subsequently escaped or set free which have ether bred with each other or other feral cats. they vary in colour from light gold through to black with and without markings.
Their tracks are notoriously rare, but the few that you find could be dog or cat, the presence or absence of claws can also be misleading.
Panther for instance do leave prints similar to dog, complete with claw marks..
Puma can leave claw marks but not always, and Im not certain why there would be claws or not
Leopards tend to not leave claw marks.
Something to look for when you are looking for big cats are scratch posts. these can be vertical or horizontal. Cats need to "pull" their claws to help them grow.
The print in the picture was taken after the animal passed...