Thanks. Well that basis, from the left, L1, L3 and L2 are the switch for the indoor utility light; unused L3, L2 and bridged L2+L1 are for the outdoor light. (The Red tape is for my benefit to indicate Live wires.)
I want to change my outdoor light. Removing the old switched (indoor) light I discovered two core and earth cables coming out of the wall with one brown and blue capped and not connected.
But on inspection the live is on one cable and return (neutral) on the second cable!
Going back to the...