The problem persisted with Kernel 4.8 - but I found it was a hardware issue: 
My power supply was faulty - installing a new one resolved the problem.

In addition I found that the BIOS battery was down to 1,3V; inserting a
new one re-enabled the "resume on power off" feature. Multi-factor
problems really are great joy.

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https://bugs.launchpad.net/bugs/1566302

Title:
  Ubuntu 16.04: Suspend freezes the system after upgrade to linux image
  4.4.0-16

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