Fix false positives

[DaveBathnes]

I've been doing some interested testing using Prince Harry's Spare book which is pretty much on waiting lists across all libraries.

A combined search suggests 50 or so copies are available but this is unlikely. They are more likely to be edge cases where for some reason they are showing as available but aren't. Good opportunity to fix these

https://www.librarybooks.uk/
978-0857504791