thanks but I went instead with a variation of John's solution, I regexed in some place holder text into each h1 tag, so that sigil could build a toc. I then edited the toc page , adding chapter numbers 1, 2, 3 etc into title field & then regexed the placeholder text back out again.
it will be find now so long as a don't touch the recreate to button!
messing with the images would have taken much longer as ever image contained a chapter number & they look good as-is.
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