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This socket had the two mains loops incoming. These were twisted together with piece s of blue and brown wire that connected to the socket. Earth was shrouded in blue instead of green/yellow.
So, a bad start. In addition to this, there's a cable wired in as a spur running down to the floor. This is also twisted in with the other wires and then wrapped in electrical tape. Again, they've shrouded the earth for the spur cable in blue.......
Friend has just moved into a new flat and asked did I could look at a few sockets which didn't work at all (never a good sign).
This is as I found one of them. Note that incoming loop connections are on red/black cable: