The "ring" light around the ign barrel isn't illuminating. Its lost its earth. As its on a timer im taking an educated guess that its switched earth from the central locking timer unit. I just wanted to confrm this, and make sure there wasn't anything that would safeguard the module to check first.
The plug has 2 wires.
The Blue/Black wire goes though pin E34 of the main harness connector plug to join up to a purple/white wire of the timing control unit. (Pin 17)
The other wire is Green/Red and that goes to pin 11 of the main light switch.