I'm putting in two new tube's into my garage however one of the them was removed a long time ago but now I have replaced it. The garage has two switches, one on the LHS of the internal door and one on the LHS as you walk in to the garage. Both switches should operate both tubes. I've drawn an image of my setup in paint, hope it makes it clearer. The problem I have at the moment is not being be able to get everything working correctly. I have succeeded in keeping the furthest tube light nearest the garage door on permanently but nothing else. I can't figure out the correct configuration. Especially with the first tube nearest the internal door which has four cables coming into it so four black/neutral, four red/live and earth. Seems from the setup a different type of wire exists between the two switches which has red/blue/yellow wires. As per the diagram the yellow wires attach to the common terminals in both switches. It would seem that the power comes into switch one which is where the incoming power connects to the common. Both switches have three terminals on L1/L2/COMMON.
Here's the layout.