I've always remembered it since secondary school since I found it odd that blue is neutral (when I think of brown as a neutral shade) and that brown is live (when I think of blue as the 'colour' of electricity)...
Indeed. The COED states:
WORD HISTORY
Posh is first recorded in the early 20th century. Its origin is unknown: it may come from the obsolete thieves' slang word posh, which meant either 'money' or 'a dandy'. There is no basis for the popular theory that posh is an acronym of port out starboard home, referring to the choice of more expensive berths, out of the heat of the sun, on ships between England and India.
I'm going to have to take extra care next time I rewire a plug now - that being said, I once acquired an old 'vintage' lamp where someone had wired the (black) neutral to the earth pin - I suppose coal is black and comes from the earth.
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