I work in the electrical distribution industry here in Australia and can conform that we are in the process of physically dropping the voltage from 240V to 230V.. Yes, the change from 240 +/- 6% to 230 +10/-6 was only a paper change but we are in the process of physically changing transformer tap settings to alter the voltage... The driver of this is that with the current 240V nominal system there are issues with voltages rising to problem levels as more and more solar cell installations are installed... While I cannot speak for Europe they seem to be having the same issues as well (do a search for 'voltage rise with PV' to see what I mean)...