Langcliffe Pot is a cave system on the slopes of Great Whernside in Upper Wharfedale, about 2 km SSE of Kettlewell in Yorkshire (UK NGR SD996711), and actually some 20 km NNE of Langcliffe village.
The book includes the claim that, mostly for shock value, Kettlewell and Helen Spurway, then the graduate student (and later the wife) of J.B.S. Haldane, were known to catch live moths and eat them whole.
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Kettlewell's peppered moth research has been disputed by author Judith Hooper in her 2002 book Of Moths and Men.
On October 4, 2009, a class action suit was filed in Ohio Northern District Court against InkStop as well as Dirk and Dawn Kettlewell for unpaid wages and benefits.
Bryan Clarke, who worked alongside Kettlewell at Oxford, described Hooper's book as "a treasury of insinuations worthy of an unscrupulous newspaper".
The one woman show was held at the Iconic Building 98 studio galleries along with a one hour lecture by Professor Emeritus James K. Kettlewell retired curator of the Hyde Collection.