I'm starting to hear people talk in km but nothing official
We use lb and stone at home for weight but medical its kg
Personally I was taught in the 80s and early 90s they trued to teach us both metric and imperial. I also did an apprenticeship in metric on imperial lathes and mills
I have no clue how less than an inch works past 40, thou being 1mm
I struggle with my weight in kg.
Miles might as well be a unit of time as beyond telling you how long it takes to get somewhere miles are useless
Bonus anecdot
When I moved out of my parents I had to ask for help buying minced beef because growing up I learned I needed 1/2 lb of minced beef but it was packaged I'm 500 grams