Reminds me of the old joke about metrication.
Man goes into a shop to buy some electric cable,says to the shopkeer 'I want 5 yards of three core flex'
Shopkeeper--'Sorry sir,we can only sell in metric.It's the law you see.I'll be prosecuted if I use imperial measures'
Man--'How ridiculous is that?Very well I'll have 5 metres of flex.How much is it?
Shopkeeper---'A pound a yard sir'.

EricT
PS Garry's comment about measurements in aviation can be heard by anyone with an airband radio.e.g distance to run in miles,visbility in kilometres etc.