whitfields guide said:
It is proposed that on January 1st, 2003 the tolerance levels will be widened to +/- 10%.
That was pushed back to 2005, and then in July 2001 the CENELEC Technical Board decided to continue with the existing tolerances until 2008.
Since the present supply voltages in the UK lie within the acceptable spread of values, Supply Companies are not intending to reduce their voltages in the near future. This is hardly surprising, because such action would immediately reduce the energy used by consumers (and the income of the Companies) by more than 8%.
In any event, the European-wide harmonisation is not being done by having common supply voltages, but by requiring manufacturers to make products which operate over a much wider range.