this is a bit of a problem , firstly , to find the correct wire for the switch if this is done in T & E then its fairly simple , with the supply OFF conect the red in the swtich to the earth , this will give you a cct , go to the light fitting and test each red to earth with your tester , this will tell you the correct red , assuming this is T & E the the other wire in the same cable (does that make sence ? ) will be the other part of the swtich , on three plate the red is perminantly live and the other is the switch line , so having i dentifed the correct swtich line , you can connect up the new fitting rememebering the swtich line goes to the fitting live to swtitch on and off
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