Ok so on the back if the intructions there was a note: it states -"we have found that some pre-1979 models, when fitted with the ignition, fail to stop running when the kill switch it operated. This is due to the very small current required to keep the electronics running. To overcome this problem you can operate the brake light or rewire the system to take all its power from the standard ignition wiring.
To do this the red wire and fuse are totally disconnected and removed. The green wires are both joined to the +15 of the left hand coil. The male terminal on the ignition box will require changing to female. "
I can certify my self as a dumbass.
This all makes perfect sense. Maybe I should read ALL the instructions next time.