Thanks to you both
@eschwartz: It looks as though Amazon hasn't noticed that the dozen or so ebooks I've done for this publisher were produced with calibre. Please don't tell them.
And there are things that azw3 files can do - like text flowing around an image - that old mobi can't do.
@Doitsu: So far as I can tell the process of using Kindlegen to make a mobi file is quite different from the process used to make an ePub file - so far as I know the HTML has to be one big HTML file for Kindlegen, but it is best practice to have one HTML file per chapter for ePub. The ebook I'm working on has around forty chapters or sections. It is this doing things differently that I want to avoid. I'd much rather do the ePub as usual then zap it with something to produce the azw3 level mobi.
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