The metric system is still deeply unpopular in this country, despite the government's official stance being to adopt it. Older people are confused by these alien units, and most people even those of school age still use a lot if Imperial units. Even the most metricated people I know use Imperial for a few things (as opposed to myself, the opposite, who uses Imperial for everything except my car's engine size.
Once upon a time our quirky units were something we were proud of, most of us still are. How many people were ever prosecuted for demanding to use kilo-grammes back when it was lb and oz that were legal?