Thank you, you gave me a clue!
I had to reset my connection (ethernet one) to get it to work. It was a lot of faffing about!
My other problem was that when I plugged the device into the machine, I could get it to connect to Calibre, but when I downloaded, made alterations and so on, it didn't work with CC's wireless connection. I would be okay with using CC wirelessly when I'm on the move, and directly when I'm at home, but the two methods aren't compatible. It has to be one or the other for updates, etc to work properly.
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