I have a ceiling rose in my hall-way (1 of 2) that both switch on and off via 2 seperate switches (I think they call this 2 way?). Anyway, I'm putting in a new light and didn't note down the wiring configuration. I have 4 cables coming through my ceiling (I'll ignore earths)... Two cables have Red, Yellow and Blue and two cables have just Black and Red. Can anyone help me understand how I connect these 4 cables together / into my brown & blue of my new light???