Trying to access an ebook and getting "This title is not available to your institution"?

We've had some reports of students getting this error when trying to access Dawsonera ebooks:

Unfortunately if you see this message it means the publisher has withdrawn the book from the Ebooks on Demand service. We have removed as many of these as we can but a few have slipped through. If the book looks very useful you can complete a Recommend a Resource form, and we may be able to purchase it for the library.

This is affecting a very small number of the over 60,000 ebooks we have made available.