> Britain is officially metric, in line with the rest of Europe. However, imperial measures are still in use, especially for road distances, which are measured in miles. Imperial pints and gallons are 20 per cent larger than US measures.

https://www.visitbritain.com/us/en/plan-your-trip/practical-information/weights-and-measures#

You are “officially” on the metrics system. You’re just restating my original point, and arguing semantics for the sake of arguing.