Hi new to this forum - I have added 2 additional outside lights (all 3 with pir) and taken the feed for addirional 2 from the original light. The cable is 3 core and earth leading from the original light to the switch indoors. The feed to the switch from the lighting circuit is 2 core and earth. The new lights I've added outside are also 2 core and earth. When the switch is on all 3 light are on, but none will go off, they are all either all on or all off. As you've probably gathered i'm not an electrician - at switch black is acting as switched live and grey as neutral so brown/back into live, grey into neutral. At light grey into neutral but black into grey, should black be wired into live also