Two way intermediate switch wiring

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Hi, I've got a problem with my landing lighting. It's currently using a 2 gang 2 way switch at the bottom and an intermediate switch upstairs. However the top switch does not operate at all. I believe that there should be a free space but I'm not sure which cable to move and where to move it to? Thanks for your help.
 

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You cannot have 2-way switching with only 2 cores connected to the lower floor switch. Did it ever work before you started on it ? It's obviously old wiring going by the colours. Where does the yellow core terminate ? Is there another switch somewhere that you've omitted to detail.
 
If theres red and blue then theres likely a yellow, hope you have not mistakenly used that as earth
 
Yes there is a yellow, which has been used as an earth I think. This hasn't been done by myself and has been like this since I moved in and I'm only just getting round to looking at it. No theres not another switch just the downstairs one and the pictured one. The green/yellow core terminates on the earth of the switch. Thanks for your help.
 
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Usually 3 wires + earth are run between switches. But something must work.

What about a pic of the switch that don’t work
 
The question is very confused and is Nicholas's second post. Is little diagram is also lacking in one wire...

Live >------2w ===========X===============2w-------------> to light(s) Is how it ought to be wired.

Lin, 2 way switch, strappers, intermediate, strappers, 2 way switch, switch wire to light(s)

The intermediate simply crosses or uncrosses the strappers like this X or =. In at the bottom, out at the top of the switch.
 
The downstairs switch works perfectly controlling the lights, the wiring for the working downstairs switch is the diagram that I have uploaded (it's a 2 gang but I've only drawn the wiring for the wiring that I'm interested in). However the wiring for the switch that doesn't work at all (upstairs) is the picture that I have included. I'll take some more photos and upload them.
 
There is something in L1 though? I read that in order to use an intermediate switch as a 2 way switch you had to have a com, L1, and L2. But I am currently using l1,l2,l3 and l4.
 
Please show a photograph of what the yellow (not the yellow-green) core at the intermediate is connected to. If the downstairs switch operates the lights then the circuit is working as a simple single switch circuit and the intermediate switch is not part of that light circuit - unless the previous owner really screwed things up.
 
I believe that there should be a free space but I'm not sure which cable to move and where to move it to?
With the power off - noting that upstairs and down may be on different circuits - switch them all off:

Downstairs - put the yellow into L2. Others stay as they are.

Upstairs - put the Yellow in the lower terminal with the red
Move Blue and put in the terminal with Black.
Top red stays where it is.
 
You have mentioned a bottom switch, an intermediate and a top switch - where is the top switch?

When you take the photos, you need to identify them with which switch they are of.

You definitely have a wire missing from you switch photo and switch diagram.
 

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