I apologise for this thread on the grounds that I have been less than appreciative of some posts on this topic, but I found this report on the radio so fascinating I thought I would post this up.
After the Clacton "big cat" story, and the radio 4 presenter Jim Naughtie saying he believed in them, there was an interesting piece on radio 4 yesterday by a Prof' Stephen Harris;
"Stephen Harris, professor of environmental sciences at Bristol University, suggested that rather than escaped big cats or wildcats, the creatures being spotted might be domestic cats that have gone feral.Prof Harris told BBC Radio 4's Today programme feral cats could grow to be "surprisingly large".
"There are some quite big feral cats out there," he said. In Australia, Prof Harris said, there had been feral cats shot weighing 40lbs (18kgs) and 5ft 9in (1.7m) long."
Now that is a big cat! And seemingly all domestic cats are descended from the Wildcat so it would make sense for feral cats to revert, the same as feral hogs have done in certain parts of the world.
It makes sense to me!