Yes installation complete.
The whole process took about 4 1/2 hours. That's from when I started again. I think the "Preparing to install updates 32%" froze for at least 45 minutes, maybe longer....

Thanks for your help - but it would seem that is was my impatience.
Whilst checking on the links you gave I noticed that the 32% had moved on slightly.
This is the timing for those interested:...

Windows 10 update to 1511, 10586 freezes at "Preparing to install updates 32%".
When this happened I did a search and followed the following:
ran
net stop wuauserv
net stop bits
Restarted...