Thanks for the help guys.
So far I've got it working manually, which is ok for now. One issue that has arisen is that the LCD remains active, even though the picture is going through the HDMI.
It either stays black(which I don't mind) or it flashes bright white and throbs in and out of brightness. Is there a way of stopping this?
I've attached this rough video to show what I mean. https://youtu.be/B2_wKHtDJ-c