American pounds are the same as ours but their pints are different. They have a saying “a pint’s a pound the world around” which is probably the stupidest saying ever, since a pint is not a pound anywhere else.
I’m 60 and was only taught metric weights and measures at school. I’m an engineer and the metric system makes calculations so much easier because it’s consistent, you just need to look at an American textbook to see how complicated imperial (or British as they call them) units are.
We already use mixed units, pints of beer and 36D bras, the EU never stopped us doing so. It’s all a ploy by Johnson and his crew to appeal to their very elderly brexity faithful. I’m sure my PIL will love it.