right,turn the power off,remove all wires cept the earths from the rose,now get a test meter put it in the ohms scale,get some one to turn the switch on and off as you check the pairs of wires,the one pair that gives a clear reading as the switch is turned on and off,this is the switch wire,one end of this goes to the brown wire on your new light,the other end goes to the loop in red,
MM
May 2011