If you read the consultation, you will see that is is only about domestic trade.
The government concede that we need to continue to use metric for international trade, and for science.
So for example they want to make a business who trades both nationally and internationally use 2 different systems? That would make manufacturing, packaging and pricing very complex. Imaging having to buy your raw ingredients in lbs and sell in kg.
We can keep our miles per hour, our 7lb babies, and our 6ft men, that won't change, but we will also need to buy our milk in pints (we may call it a pint now, but it's actually 568ml. If all factories and processing plants have to be recalibrate to pack 1 pint this surley has a large cost involved), and our food in lb and ounces.
I'm 50 and have never learnt imperial, apart from general conversational use, and wouldn't have a clue where to start.