<A photo of an MK socket which, if damaged by overheating, could have been overheated by a poor connection in the socket or a plug.>
1) you mean two cables, each with 3 wires in them? To find out if it is a ring, turn off the power, test for dead, and then test for continuity between the two reds (or browns), the two blacks (or blues), and the two greenandyellows. Never assume.
What is the rating on the back of the MK socket?
It is 13A isn't it?
No, it's definately heat damage.
I don't know why, but overloaded sockets always crack just like that.
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