I can't give you figures, but I can tell you anecdotally that many hunts would end in failure.
Yes, it's seen as a class issue. The Labour party banned fox hunting - ostensibly because it's cruel but really because about two centuries ago an alliance of Tories and Liberals caused baiting of Dogs, Bears and Badgers to be banned.
Hunting is a "Field Sport" in British parlance because you go out into "the field" and hunt, and properly fail. However, the League Against Cruel Sports classifies it as a "Blood Sport" alongside the aforementioned baitings.
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