W10 did not find my onboard ethernet (the MB is less than 12 months old) when it first started but it was happy with the old PCI ethernet card I had installed as a backup.
I had a fixed LAN IP set for my PC and port forwarding set up for my Calibre server port.
I've just discovered that since the W10 upgrade my PC was running with a different LAN IP to that set in the router though I don't know how that can occur. Having reset everything I can now access the server from the internet.
Thanks for the help and suggestions.
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