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"when I open the file in Calibre I change the font size"
What did you actually do? It reads as if you opened the epub in the Calibre Viewer, then used the zoom button. If so, then this won't work as it doesn't change the epub."
I think that is probably what I did, I didn't realise that it was only a zoom tool on the left side of the Calibre viewer.
Anyway, I've used Option 1, and it seems to have done the trick. Many many thanks!
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