I have finally solved it by quizzing a more digitally informed member of my club. The answer actually was in TonyMiller's screenshot of the export page of Lightroom had I had the wit to look at it properly (and also in an earlier suggestion from Terry S).
I have resolutely tried to maintain the 'Quality' (Terry S's Compression?) as high as possible ie 100% when reducing it to even 75% makes a massive difference to the file size but not on-screen quality, hence allowing a bigger image. I have been advised that lowering it to 60% (as in TonyMiller's screenshot) is OK.
I hoped I would get there in the end. Can't help being thick!
Mike
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