Have submitted a support ticket. I've got an unfound table zp_userdata coming up in error messages, but it seems to be looking at the wrong database in the mySql error so that could be contributing to the problem. Have asked for support in changing the database that the system looks for - as the zp_userdata table is present in the correct database.
Hopefully that is the problem (which would mean that it's not really related to the upgrade at all!)
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