Right heres the situation: I have a two way switch at the bottom of the stairs beside the door that controls the light on the stairs. Outside i want to add a light with a sensor. To do this i think i need to change the switch to a two-gang,then run a 3-core cable from the switch to the outside light by takin a feed off the switch already in use (2-way) using a link. Pretty sure this is right but would be handy if somebody could tell me what cables go where in the switch as someone said something about connecting a neutral in a connector block and taking one out the same block to the outside light? Thanks in advance!