Hi, I have put up a light for someone outside their garage. The wires were already installed by the electrician previously. Putting the light on was not a problem, but the other end of the cable from the light had been left behind the existing light switch that powers the internal garage lights ready to be connected.. Assume this would mean the outside light would come on when the internal ones were put on. I am unsure where to connect the wires into this switch, can anybody help?. Photos attached for info. Many thanks