Thanks, interesting!
It tripped and seems to have reset successfully. Not sure how to test it though - the doesn't have a test button like the RCD.
The MCB tripped too. I'll test it tomorrow.
I think that side of it is OK - sockets and shower (but not lights) are on an RCD protected circuit.
Thanks - and to everyone else.
As to the 'cause of the cause', does it seem likely that there was a stray strand at the live wire? So whoever wired the plug? I'd add it was a 13A fuse fitted - which might suggest some lack of attention to detail.
Its quite possible - something caused a flashover between the L & E terminals - you can see that from the erosion of the metal in the location. The most likely cause I can think of is a strand of wire - but it could possibly have been moisture in the plug... or perhaps it have had a previous fault and that left a conductive film on the plastic in the area.
Perhaps...
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