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I'm seeing the pictures now. I like these kind of puzzles. Perhaps a socket was planned at that point but they changed the plan. If you have plans for an electric cooker then you might need to check the rating of the current cable. Maybe they used one earth for both circuits? It would still provide a similar protective function, just not allowed any more. Looks to be a radial circuit, unless the earth belonged to the cooker and the other 2 wires are a switch line or as you say a spur. If you look in the CU you should be able to see if there are 2 line conductors going into the breaker (ring) or 1 (radial).
You could do with a little cheap fuse finder. With the power off you connect the sender to a wire (in the cu or socket) and then trace that wire with a receiver. They seem to be available for £15. The more expensive versions will work on live wires and are a bit more accurate.
It's probably easier to take it all out and rewire it in singles in the new colours. Label the ends as you go and you should have an easy time of it as long as you don't run out of space in the conduit.
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Airhead
Yeah, re-used the existing wiring then, might take you up on the bending tool if you have one?
Been uncovering some more, here's the overview:
The flat is wired through steel conduit, here seen vanishing into the ceiling:
Top right of our first diagram we find more of the conduit, coming down inside the wall from the ceiling:
We have cooker wiring and two sets of L/N, one earth.
Same again when we look at the once-was-socket:
Which looks like it may never have been a socket based on the un-cut wires in there.
I would think that the conduit goes straight back to the CU, not sure where the wires that exit the no-longer-socket go, possibly this room was wired as a ring and they go back via the two extant sockets (one on each of the other walls).
That would, however, make the existing wiring into a spur, as clearly it doesn't have continuity through the stuff I've uncovered.
I'll get a sparks in, this is turning into an expensive week!