Thanks for all the suggestions; I'm going to give Sigil another go and install Kiwidude's "Open With Plugin". Spell-checking within Sigil would certainly be really helpful here!
I am currently using the Tweak ePub option but I don't have a WYSIWYG html editor so it's back to plain-text editing. Hence my thoughts that maybe the calibre reader could be extended. Also, proof-reading a whole book takes some time and the reader has bookmarking to carry on where you left off, unlike the Tweak option.
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