I have a two way lighting circuit in my hall and landing. There was a light switch in the landing and hallway which controlled just a light in the hallway. I have had installed a light in the landing and connected to the light switch in the landing. I don't know if the light switch downstairs was changed or untouched. The problem I have is that you can turn both lights on from the hall but if you then go upstairs and turn the landing switch off it only turns off the hall. Then if I go back downstairs and turn the hall light on and off the landing doesn't go off? Someone please help.