I just bought a house and am not sure what the guy before me had done, but I have inherited his problems.
I installed some downlights, wired them up and was about to connect them all up to a two-way switch. The existing wires aren't connected to the switch, but the ones I have are Red, Blue , Yellow and Green. The ones going to the lights are standard Red and Black.
The point at which they are to connect in the loft is where one light's wiring is going to another.
As I am not an expert, could you let me know which wires should go where? I'm not to great on all the terminology.