Further to previous answers, even if British people did routinely think in kilometers, Nigel wouldn’t.
Try buying anything in a builder’s merchants.
Mind you, I think a lot of that is just them messing with ‘outsiders’. Whichever measurement you ask them for, they’ll insist on looking at you blankly and asking what it is in some other system.
“I need 7 3/4 inches of 3"x3” timber".
“What’s that in cubits?”
