Thank you. Until the last para I thought you misread my question. The mobi and AZW3 files are the same size. I'll take your advice re the mobi file (although it looks fine in all the apps I have), but it's the ePub file that's the problem. I can't see people being happy to download a 300MB file so I'll try the optimizer solution. I forgot to mention that I tried reconverting the AZW3 file to ePub but it was badly non-compliant (although it did drop the size to 10MB).
Paul
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