I think I may have mislead you. In their normal form, the quotation marks, apostrophes and em dash characters all show. However, when I downloaded the book, the left quotation was shown as Unicode 0082 and the right as 0083. These are non-displayable characters in any font, but were consistently used throughout the book to represent quotation marks.
Therefore, I need to replace these 0082 and 0083 characters with “ and ” respectively.
If I use Calibre Editor to see the downloaded text, none of the 0082 or 0083 characters are visible. I have just determined that a space is displayed, which one can copy and search for.
In Sigil, they are displayed as question-mark encased in a square.
It is these non-displayable characters for which I am seeking advice.
Sorry for the confusion
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