My mate wants me to change a pendant to a light fitting with a pull cord for the fan blades i dont know if his house is 3 plate method or in singles.Is there sw for light plus perm live for fan pull switch needed in these or is just sw needed?I cant say ive put one of these in.I mean you dont want to be able to just use the fan pull when the light is on , ideally when the light is on or off plus he wants a one gang switch changing to a dimmer?help please