[Mike Wightman]

We brits revised our imperial units, you colonials continued to use the pre-revised version for your weights and measures. There have been changes over time I will grant you but inch, foot, yard, mile, pound remain the same, mind you we still use miles in the UK and I can only tell you my weight in stones and pounds and my height in feet and inches...
"However, in the U.S. the term "imperial" is often used colloquially in reference to the U.S. system."