Hi KevinH and DiapDealer,
Thanks for your kind advice, which seems to have solved the problem.
I added the latest Sanitychecker plugin to Sigil and opened the html file. I manually fixed all the messed up html escape entities using find and replace and then ran Sanitychecker. It then came up with the message 'No problems found!'.
Then I went to the Preserve Entities preferences and deleted the entities I had and then re-entered them. After closing the html file without saving it and re-opening it Sigil stopped messing up the Escape entities. Not sure what exactly happened there, but perhaps I had entered one or more of those html entities incorrectly. Anyway, it seems to be working properly now. Many thanks again for your help.
Paul
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