OK, I rebooted, got no menue, but that's supposed to be normal, logged in ok, and after typing uname -r, uname -v, it seems I'm running kernel, #51.

Which should be the latest kernel, so it seems everything went ok, touch wood.

The Upgrade page says to make the change perminent in the MBR I need to do,

sudo upgrade-from-grub-legacy

Is this still the case?

Thanks to everyone for your help, nuch appreciated.