England only half uses the metric system, they still have things like the pint, the pound, sometimes feet, miles where in other cases they use metric units like millimeter, kilometer, meter, etc.
The US is similar for example our military uses meters and kilometers for measurement of distance and millimeters to define ammunition and munition calibers.
We use the metric system for pretty much anything professional, I believe.
But the more casual things, like weighing people, or measuring the height of people, or measuring distances/speeds on roads/vehicles, or volumes of drinks in pubs, we stick to Imperial.
But, then, if you go to shops and things, all our weights there are in grams/kilograms, and liquids measured in liters.
Even milk comes with the measurements in litres. Although the cartons usually have a pint measurement too for reference.
There's not really much of an issue with splitting the use of Metric and Imperial for different things, so long as you aren't usually trying to use both for the same thing.
The only thing I wish I was taught better was converting distances from Imperial to Metric. I'm rubbish at that, and I prefer Kilometres for distance. They make more sense to me.
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