I was considering buying a shiny new 12V 1600W power supply to replace an old one with a second hand miner but I'm seeing conflicting figures.

Mains electricity Voltage here at 50Hz was 244 Volts rms typical last time I checked and formally could go up to 253 Volts in this region.
Bitmain advertise their APW3 power supplies for 220 Volts and up to a maximum of 240 Volts.  As in "it might break" if it functions as advertised.

I read elsewhere online that they are good with British mains and rated up to 264 Volts.  I do not make sensible purchasing decisions on a single source of internet gossip.  What works in the UK ?

I just got a useless reply from Bitmain support "Please send us the Order ID and a picture of the SN tag. "