Old bakelite light switch has broken so new one required. It's one of three that try to independently control the downstairs and upstairs hall/landing lights.
Historically the upstairs and downstairs switches have worked fine inasmuch as we could switch the lights on/off from either switch. The middle switch on a half landing by the bathroom has a mind of its own - it will switch the lights on and off but if it is switched on then the other two switches won't work at all.
I eventually found a reasonable facsimile of the switch to be replace and ordered it in 2 way style. I wired it in the same way as the old one, at least as far as I could work it out. However, now, the upstairs and downstairs switches both need to be 'on' for the lights to come on and the landing switch will only work if both the others are off
![Crying or Very Sad :cry:](./images/smilies/icon_cry.gif)
I've looked at the wired and got even more confused:
Upstairs - 2 red, 2 blue (intermediate switch?)
Halfway - 1 red, 1 blue, 1 black (three terminal switch)
Downstairs - 1 red, 1 blue, 1 yellow (and an earth not connected). (three terminal switch marked, Common, 1 way, 2 way and a 4th marked loop that's not connected to anything).
Before I call a sparky out, any clues?