changing a single light switch to a double

13 Oct 2008
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United Kingdom
I have fitted a outside security light and wish to link it to my single light switch, I have bought a double switch cover and when i have gone to wire it in I have found that I have 1 red wire going to L2 and 2 red wires wound together into the common with no earth. How do I wire this so that I have the two switches working independently?
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