Where the Hell is Roger?

I am in the course of reading Mr Chris Donald's autobiography, Rude Kids. Chris Donald, for our foreign friends, is the founder of Viz, a comic for grown-ups (and students, on whom I believe it to be wasted). It's a bit rude, as is the book in parts.

I was entertained by his recounting of a tale concerning the late great Peter Cook, Mr Donald's greatest comic hero. During the 90s some low budget animations were made of a couple of the strips at the behest of John Brown the publisher, namely Billy the Fish and much to Donald's chagrin, his pride and joy Roger Mellie, the Man on the Telly. Again for the unititiated or colonial, Roger Mellie is a complete grotesque, the most profane and misogynistic gentleman alive and a television presenter to boot. An utter delight in other words. Chris Donald was unsure until he found that Peter Cook had been hired to give voice to Mellie. One would have thought this to have been a most apt choice as Pete was not a stranger to the scatological. Many will remember the three Derek and Clive albums he made with Dudley Moore as being the highpoints of English sweary comedy.

Everything went very well. Except, that is, for the rather unusual fact that the great Peter Cook, arguably our greatest comic genius, was totally incapable of saying the word "twat", preferring instead to pronounce it "twot" like someone forced to repeat it against their will in front of a disapproving relative. He had to be repeatedly coached in the correct form by the upstart humourists.

It must be the only sweary word in the English language capable of being mispronounced and that rather defeats the object, surely?