So DR Jane what did you have to do to get your books back on your new nook?
My books returned, well one did easily and the other I just needed to access my Barnes and Noble library and download it again.
With a bit of work I remembered how to download my Overdrive (public library) and get that working again. I tested I could download a book to be sure it was ok.
I did find where to add the 2nd email address. Basically all is fine again except for the annoying extra 5 books in my Barnes & Noble wish list that I have purchased. They even show I have purchased them which is why I can't remove them.
The Nook works as smoothly as a Nook will work so I am very happy.