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Thanks to all for the suggestions, I had assumed that there was some existing functionality that I had missed - clearly not.
Picking up on davidfor's idea I could create a custom column for each device with Y/N/(undefined) options and set them all to Y when I edit a book; then reset the column for the device when I upload it; it does rely though on a manual process and one I will probably overlook at some point.
BobC
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