I hope someone can help. When removing the switch plate to the hall light two wires were hanging loose so I was unable to identify where they should go on the replaced switch plate. This plate looks very complicated as it operates the downstairs and upstairs hall light. Also there is another switch (one gang) in the hall that operates the downstairs light in a different location and another one gang switch that operates the upstairs light, upstairs. (3 switches, 2 lights) Behind the two gang switch there are 3 grey cables. Two have 3 core wire (green/yellow, red, blue and yellow) and the third grey wire has two core (earth and two red wires). I have included a diagram. I hope it is clear. The two wires red and blue marked with a question mark are the wires that I can't identify a place for. I am not sure that the other wires are in the correct position either as I have always had a problem with this switch not working in conjunction with one of the one gang switches. I hope someone has some ideas cos I've looked at the wiring diagrams for lighting circuits and can't see any relating to 3 core wire.