At least - thankfully - sterling adopted the metric system; I remember, as a very small child, the old system (twelve pennies in a shilling, twenty shillings in a pound, and so on).
Volume was no problem (pints or half litres), neither were miles/km, or temperature differences scales (I simply learned both off) as it is relatively easy to switch from ounces and pounds, to grams and kg, and whenever I landed in a new country, the first thing I would ascertain was the unit of exchange (depending on which currency we were paid in; some early missions it used to be dollars, more recently it is Euros) with the local currency and use that to multiply or divide mentally - it didn't have to be exact, a close approximation was sufficient.
@LizKat has written about measurements in recipes: While I have no problem in switching between European or British measurements, some American ones really floor me: A cup? What on earth is a cup? I know that in the context of US cuisine that this is a specific unit of measurement, but, every time I read it, I find myself mentally debating whether this cup that is called for is my coffee cup, or my tea cup.