Thanks for replies - have updated system spec in reasonable detail.
This morning I thought to sort the WU by name (ie same KB), and many were in groups of four, three fails and one success - this was a great relief. However some failed completely, but at a glance many did install.
Re-running WU says I am completely up to date, only additional languages coming up.
Do I need to go through each update set and find those that failed completely, or can I trust MS WU to tell me what has failed?
BTW I have already done the following:
cleared my temp dir
ran SFC /SCANNOW
ran the windows update readiness tool
ran the windows mrfixit for windows updates
Thank you again!