theducks and mrmikel --Thanks again for more useful thoughts.
I was fortunate with the book in question that the "text" used would not appear in any normal context. Also I had looked all through the html pages and knew a search and replace would work.
I take on board the suggestion that a full search and replace is potentially a disaster and that a softly, softly approach is more certain. That is now my preferred approach.
Thanks again for all the help both on this thread and on many others.
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