"Wildlife trail camera owners in UK think they have "big cat" pictures"
I am the blog creator you are linking to, and for the record, WE DO NOT think these images are of big cats. We do say so on the page you are refering to. The images were placed on the blog to show what the public are sending to us of what they think is a big cat. Not what we think are big cats
I agree that none of them are of what we would normally think of as the big cat, a melanistic leopard or jaguar.
The only one I can safely comment on regarding size is the last image where the cat is seen partially obscured by the grass. This was taken with one of my own cameras and the branch above the cat has been measured by myself, and I can confirm that the cats body length is at least 3 foot with a tail longer than a normal domestic cat would have. It's size means it is not a full grown leopard, so it's identity remains unknown. It could be a juvenile, as there are reports in the area of cats with cubs, or it could be a hybrid of some sort. There are scottish wildcats in the area, as well as feral cats.
All I can say is that a 3 foot body length for a feline is twice the size one would expect from a normal domestic or feral cat.
We will keep looking
Big Cats In Britain