Enabling AMD Catalyst Driver in Windows 8 causes Laptop display to be turned off
After day long of forced reboots, and troubleshooting, I think I've managed to get this working.
I had to disable Microsoft's Intel HD Drivers. The thing was when the AMD drivers were activated, the display was routed via the AMD Drivers but the Intel driver route was still set as 'default', preventing the display being shown.
The extended desktop setup now works fine