OK, so what *is* the correct mains voltage in the UK?

I was always taught at school that the mains was exactly 250V. But I 
can't find any documents anywhere which claim that this is the case.

According to Wipikedia (which is never wrong), the original 
specification was

   240V +/- 6%

This was then revised to

   230V +10% / -6%

and then revised again to

   230V +/- 10%

which would therefore allow anything between 207V to 253V.

So does that *really* mean that all UK equipment is supposed to work 
with absolutely any voltage that falls between 207V and 253V?

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