Analysis of information sources in references of the Wikipedia article "Calais" in English language version.
In speaking of French cities and towns, it is a mark of refinement in education to pronounce them rigidly according to English rules of speech. Mr. Fox, the best French scholar, and one of the best bred men in England, always sounded the x in Bourdeaux [sic], and the s in Calais, and on all occasions pronounced such names just as they are written.