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Both gangs are the same, yes. Wiring at the lights is standard but a bit tatty (old house) and old colours.

I'm not sure - both lights / dimmers now working fine (but without the red cable that connected permanent live across the L2s, which I could not get to fit). Thanks for your help.

Hi, I had one further question - I have the two way switch now and all looks good. However, on the old switch there is a red wire running between the two L2s. (In the first picture posted it is the left-most wire on each side.) Does anyone know what this is for and whether it is necessary? I am...

Thank you very much!

Hi - thanks for your help - image of the new switch attached.

Hi, I am trying to install a new double dimmer switch to replace a normal double light switch, but the old wiring / new switch is confusing me. My old switch has L1, L2 and Com, but the new switch only has L1 and Com. The connections to the old switch are: L1: Red and Blue L2: Red and Yellow...