Thanks for the replies guys.
I used ProcExplorer to see what was active & it showed zilch, I checked the FW logs - also 0 info on any port that I could identify with the process.
I went thru my services & started killing them off (stop + manual start) & ran a cleaner.
Cold booted over the last few days gradually re-enabling the services & with everything re-enabled, & it started behaving yesterday.
So a total loss as far as info goes.

I can say PL settings hadn't been affected during the update (keep awake was off), & it wasn't OEM 3rd party rubbish as I build & 'program' my own boxes, (Well OK, that stuff is sneaky but I
try to avoid the rubbish

).
So I'm hoping it was some app playing with its' updater & not some malware that was trying to make a home for itself (Do not want any of this ransomware which is so prolific right now!). Box appears clean AV-wise, so the mystery remains.
BTW I should have said w7x64, but I will try the link info on my w10 install,thanks Ed. My w10 is basically a redundant experiment until MS get their '
patch & break' ethos sorted!
