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Ok then reluctantly I looked at hacking code from the endnotes.sty TeX code.

And this seems to work and so far gives me the right page numbers:
(encourages me to look at learnig TeX!) Put this in your preamble after you have called
\usepackage{endnotes}
or in your own .sty after
\RequirePackage ...

Dear Latex Community,

I am trying to get back refence page numbers into endnotes, so that the original page of the entry appears in the end note.

So far I have tried looking at redefining the relvent part of endnote.sty in my preample, but that is in TeX and quite new to me. So working in TeXWorks ...