Would you believe that after all that mucking around, I rebooted and the boot menu came up (which I haven't seen for a while) so I jumped in and tried the solution above (post #5) AND IT WORKED!! Problem solved!!!
(I had been trying to get that boot menu up but just kept getting the grub terminal screen. What we did must have re-enabled it).
Definitely thank you very much for your assistance. 
Cheers,
Reg.
Edit: Note to self - ensure grub menu is displayed by updating /etc/default/grub file to unhide menu and set timeout greater than 0. Then sudo update-grub to apply changes.