my bathroom light with bayonette bulb, is going to be replaced with a double headed spotlight, I see under the spotlight housing the plastic box that the wires are screwed into, which are lettered (L for live etc), however, the ceiling light which is quite old I guess, has two grey cables coming out of the ceiling - each with two wires: black and red. So, there are 4 wires in total - and I assume one cable is connected to the light-pull and the other to the mains (this as far as my technical knowledge goes). so, there ar 4 wires, from two cables, but only 3 points on the new spotlight. what do i do....other than move into a tent??