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Yes I knew that but there are no non-standard characters. I have just found the error. In some way - and I cannot understand how this was missed by FlightCrew which gave it a clean bill of health - the last two metatags and the closing </metadata> tag had become moved to the end of the content.opf file just before the closing </package> tag. I had done no edits to the file which was produced automatically by Sigil. I cut/pasted them back into position and all the errors went away. A mystery.
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