The LINK between the two individual switches at the downstairs switch looks like it's in the correct place.
You should observe between the landing switch downstairs, and the landing switch upstairs, there is a red and black, using the 1 way and 2 way terminals. It is not vital which way round they go.
You have that link feeding the common terminal at the switch for the landing downstairs.
And upstairs in the common terminal you have the red that goes to the landing light.
I suspect this is what you have already done. Re-cap over.
In the meantime it may be an idea to re-draw your diagram, and send it in. That way you should understand it better, and we can refer to it when we get you testing the circuit with a multimeter.
Please remember the wiring may be connected to more than one circuit (don't think you confirmed this yet, apologies if you did), so make sure the power is off upstairs and down before working on it.
You should observe between the landing switch downstairs, and the landing switch upstairs, there is a red and black, using the 1 way and 2 way terminals. It is not vital which way round they go.
You have that link feeding the common terminal at the switch for the landing downstairs.
And upstairs in the common terminal you have the red that goes to the landing light.
I suspect this is what you have already done. Re-cap over.
In the meantime it may be an idea to re-draw your diagram, and send it in. That way you should understand it better, and we can refer to it when we get you testing the circuit with a multimeter.
Please remember the wiring may be connected to more than one circuit (don't think you confirmed this yet, apologies if you did), so make sure the power is off upstairs and down before working on it.
