"Nick Maclaren" wrote in message
...


I am, of course, old enough to have been taught using the previous
units - but I defy anyone to produce an experiment that could be
carried out in a school that could tell the difference between an
Imperial and a metric pound or foot :-)

Or, indeed, any of the dozen or so seconds that we have had since
1950 ....

I still work in ells ...

Mary