Reverse direction of light switch

Joined
11 Jan 2013
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Manchester
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United Kingdom
Hi all, I hope you can help. Might not be possible. I only have very basic electrical knowledge.

I have a light that is controlled by two switches. One upstairs, one down.

If they are both in the 'off' position, the light is on. If they are both in the 'on' position the light is on. It is only when they are opposite (i.e. one on, one off) that the light is off.

I want to reverse the direction of one of the switches to correct this. Is this possible? I have posted a picture of the upstairs switch.

L1 contains a brown wire
L2 a black and brown
L3 a blue and grey
Any help appreciated!
 

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