aahhaaa... I think I have found the solution.
MOBI format will only preserve paragraph spacing if the css margin-top is used. It will ignore margin-bottom. Further, the units of margin-top must be in Ems or similar, not cms.
My paragraphs were formatted mostly with space after, rather than space before. Bit tragic really!
Further, in my setup I started with an .odt file, with paragraph spacing measured in pts. Calibre has converted this spacing into cms. Is there a way to persuade it to make the conversion into Ems so the MOBI format will read it?
I hope this discovery might help others mystified by the vagaries of Kindle and paragraph spacing!
Thanks for you help.
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