What is the household AC electrical power mains voltage in the UK?

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Like in whole Europe in the UK it is 230 Volts, AC 50 Hz. This is allowed to vary from a lower limit of 216.2 Volts up to an upper limit of 253 Volts.

For more information see the answer to the Related Question shown below. <><><>

In the world we have mostly 220 to 240 volts 50 Hz (blue) or 108 to 132 volts 60 Hz (red). Scroll down to Related Links and look at "Worldmap for AC Voltage and Frequency - Wikipedia". <><><>