As an American, I'm puzzled by the persistence of SAE measurement references in everyday U.K parlance. One striking recent example: in "Sherlock", the warning

As an American, I'm puzzled by the persistence of SAE measurement references in everyday U.K parlance. One striking recent example: in "Sherlock", the warning message outside Eurus' cell said to "Stay back 3 feet" (as opposed to "1 Meter"). In everyday conversation, people seem to refer to bodyweight most frequently in stone. Etc.