Ok cool, that makes sense.
Yep I've found the orange/yellow wire, along with 6 other wires on that terminal.
Now what's confusing is I've got 2 red/green wires, one is on its own in the center of the switch, the other is joined to 2 black wires on an outer terminal.
The center one is the one with no power, the one joined to the black wires has power.
According to my drawing the stand alone wire is the neutral safety switch.