Thanks for all the suggestions.
Here's an update:
After countless rebooting, installing, uninstalling, reinstalling and printer on/off, we have made progress. The final installed drivers and common updater that I downloaded from the epson uk site seems to work. The driver version is still 8.64. However, the dmg is not the epson14359.dmg.
The printer is printing from LR4 and other apps. I can select my Media Types now. However, I can't select the Epson Advanced Black and White (ABW). I understand that this is the norm with LR4. Can someone confirm this?
Cheers!