Do you believe big cats roam the British countryside?

A regular feature in my local press is some guy claims to have seen a big cat. Occasionally it's accompanied by photo of a blurry black blob or what looks like a pet cat. Bring up the topic down the pub and someone will claim they once saw one.
Yet no one has managed to get any definitive proof and examinations of livestock kills always prove to be dogs or natural scavenging by foxes, crows etc.
Yet the number of sightings are increasing.

My own experience is that animals often appear larger than they actually are if viewed at an angle, and these are just feral cats. But what are your thoughts?
Do you believe big cats roam the British countryside?
Do you believe big cats roam the British countryside?
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