Ash,
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The three 2.5mm wires attached have melted at point and appear charred.
I'm sort of guessing here, but wouldn't 2 of them wires feed a Ring circuit?.
Also, having a 2.5 on a 32A circuit is a bit rough (I'm talking about the extra wire).
Oddly enough we had the Wylex equipment here as well in the 1960's. [Linked Image]