Quote:
It seems from their ad that overvoltage conditions are common.

Britain was traditionally 240V. Much of Europe was traditionally 220V. The EU standard was set to 230Vą10% so as to encompass both 220V and 240V so that the existing power companies didn't have to change and so that existing appliances wouldn't be obsoleted. But new appliances are designed to run on the standard., which means that they can run on voltages as low as 207V. (Britain has a stricter standard, 230V+10%-6%, so that means that the floor might be 216V there.)

Anyway, the point is that 240V is what Brits get, and is well in the upper half of allowable voltages.
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Bitt Faulk