Hey Peter,
Thanks for trying to help. I know I'm obviously doing something wrong but not quite sure what. I have both Kobo plugins enabled, should I not and if not, which one should I use?
I think I'm entirely missing where the shelf info is? I have selected Create Bookshelves and Delete Empty Bookshelves. Restarted Calibre when making the changes but I still can't seem to transfer books into a shelf on the device.
Sorry!