Thanks for the above.

My process was to boot into live environment, then (as root):
- Set up my chroot as per 
http://superuser.com/questions/376470/how-to-reinstall-grub2-efi 
- Add deb http://au.archive.ubuntu.com/ubuntu/ trusty main restricted to my 
/etc/apt/sources.list
- apt-get update
- apt-get install efibootmgr=0.5.4-7ubuntu1
- update-grub
- efibootmgr -c --disk /dev/sda --part 2
- efibootmgr -v # verify a new record called Linux is there

Reboot and happy days
Thanks everyone for your contributions

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https://bugs.launchpad.net/bugs/1387654

Title:
  installing or upgrading to Ubuntu 14.10 kills Boot Manager on ThinkPad
  W540

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