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Andy Wade

wrote:

So there couldn't be a more sinister wirig problem at the root of
this?

Loose terminal screws and/or fuse clips in the _plug_ is the most common
cause of this. If discolouration is evident I'd replace both plug and
socket as a precaution. Ensure that all terminal screws are really
tight, that the end-caps of the plug fuse are clean and that the fuse is
gripped firmly by the clips in the plug. Also ensure that the plug's
cord grip is correctly used and firmly clamps the sheath of the flex.

--
Andy