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What is not so cool is that the mains in my area seems to have gone up to 250v.

Mine has been up above 250v for most of this year, regularly triggering my UPS's trim feature. As of last week it now is down near 220v, regularly triggering my USP's boost feature. A series of big droops this week as well, enough to take the ADSL line down.

UK mains voltage is 230 V +10% -6% (216.2V - 253V). Anything within those ranges is still in spec has to be handled by your equipment. If its higher or lower than you can report it as a fault.