I appreciate the feedback.
Having taken a step back and examined the wiring and where it's running I now have a diagram of how the flat's sockets are linked together.
Each socket is wired to the main fusebox directly and hence it can work quite happily without the second one. The...
I recently took off a wall socket to find that there were two power cables wired into it. If I attach a new socket to just one of them it is live and I can use that socket, however the other wire isn't (so a socket attached to that one won't work)
Why does each socket appear to be dual wired...