
I was a child in Infants school during metrication.
So I think in cm, and metres when it comes to maths, but my Home economics was done in ounces and pounds, so I can't to this day visualise what a KG looks like other than a bag of sugar, but pounds and ounces no problem. Same think with liquids, pints and fluid ounces.
I never had money before we changed so have no idea about old currency.