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

Get a multimeter and a car and you could probably make a nice picture :-)

> I was always taught at school that the mains was exactly 250V. 

I never heard that before.

> 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?

Yes.

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