Looks like the older type of aluminium wiring. Quite possibly not used any more. Would be worth checking though!
It was all wired into the socket that was there previously so, after a bit of cursing as the stranded wires wouldn't fit into the connectors I originally had with me, I connected them all back up again behind the blanking plate.
@aggi started
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Looks like the older type of aluminium wiring. Quite possibly not used any more. Would be worth checking though!