Big cats in the Uk:
I do actually believe that there are big cats around, just too much evidence.
BUT I also think that a lot of sightings are domestic cats.
Our garden backs onto a large school field with trees and bushes round the edge. I look out of my bedroom window onto the field and know it well. There are often foxes playing on the field, and domestic cats, inlcuding our own and occasionally a dog. So I am VERY familiar with different sized animals on the field.
One morning I looked out of the window and froze. On the far size of the field, (which isn't actually that far away) was a large cat standing by one of the trees. It looked the size of a panther, it was huge. I was so amazed that I stood rooted to the spot, didn't think of getting camera etc.
I watched it walk down the side of the field, past bushes and trees, and the whole time I was convinced it was huge, 3 or 4 times size of a domestic cat. Dark colour, but not black, splotchy coat. I was absolutely sure that he was large, bug cat sized and that I was seeing one of the rare big cats living in the UK. I am sceptical by nature, and not at all woo, and I was 100% sure.
Then he passed in front of a particular bush and suddenly he came into correct perspective and I could see he was a domestic cat. The whole thing had been an optical illusion due to his position. I really had to blink, look again and then again to be sure that I was seeing the right thing. yes, he was just next doors' moggie. I was actually quite shaken at his sudden 'size change'
I think this is true of quite a few sightings. Optical illusions due to perspective