I still say how heavy I am in stones and pounds and how tall I am in feet and inches and although I do know how tall I am in cm (156), I couldn't tell you in kilograms how heavy I am.
So it is synchronic change happening and it's a long process, as this article from the BBC website reveals.
It is very worth being able to nitice and discuss metric vs imperial terms being used in the exam (even by the symbols e.g. 5', 1") so that you can see evidence of diachronic change and link it into synchronic change in current language use.
Read widely on this.
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