Whilst we use metric units at school, a knowledge of imperial units is still an important numeracy skill. Conversion between metric and imperial is often a question on exam papers as well.
Despite being introduced into British schools in 1974, the metric system has only been introduced gradually in the UK.
Road signs still show distances in miles.
Yet fuel is priced per litre.
Football pitches are measured in yards.
Yet rugby pitches are measured in metres.