"Les Hemmings" writes:

Hang on! Didn't the uk change from 50hertz to 40 hertz to bring us
into line with europe a while ago?

Nope -- Europe's also 50Hz. We did change mains *voltage* tolerance
from 240V +/- 6% to 230V +10%/-6% to match European standards in 1995,
but in practice the mains voltage in most places falls comfortably
inside the new range already, so nothing much has changed.

Changing mains frequency would mean an awful lot of people would need
to buy new clocks...

--
Adam Sampson http://offog.org/