not totally conclusive (because of the two 'exceptions') but all but two of the 1-way switches in this house appear to be 'that way up' - so I imagine it was essentially 'on purpose'. The house was rewired a bit over 20 years ago.
Yes, maybe. Needless to say, I haven';t got a clue as to who did it, and why.
I think it was re-wired around 2000 - certainly all in 'old colours'. For some reason, although all of the sockets (of which there is a pretty generous number) have been properly 'mounted flush' (sunk in), nearly all of the light switches are on surface-mounted pattresses.
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