Thanks to all for assistance with this. The issue appears to have been caused by Comodo Firewall. After reinstalling Comodo and running through the actions (load book to library, transfer book from library to device, transfer book from device to library) it appears there were permissions pop-ups from Comodo which did not occur in the first round. I don't know how you would retrospectively direct Comodo to give permissions to Calibre without the reinstall that I did - I imagine it is possible - but it is slightly annoying to have missed these requests and notifications the first time round. I suppose it means that Comodo is doing its job though, even if it's a bit over enthusiastic.
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