"Industry are against it since it will add significant cost and regulatory problems, and with the UK already struggling under Brexit importation issues, it would be very self-destructive."

That isn't the case is it. Lots of people with vested interests say there are issues, but it turns out they just want government to ease the path for their operations and bring in lots of immigrant lorry drivers so they don't have to pay a proper wage. Pandering to exporters and big business is why Brexit happened in the first place.

There is no reason for the EU directive and it should be scrapped. The market can then decide what weights and measures are appropriate for their supply chain. That allows an increase in competition which is always a good idea.

Very likely little will change other than milk will return to just being in pints, beer will have a pint label on it and we can sell things to the USA in the measures the USA uses, while potentially avoiding the relabelling required for US imports.

The UK import mechanism is entirely under the UK's control. If it is onerous then now we are out of the EU we can streamline it. Given our very strong consumer laws we don't need the 'hard shell' approach so beloved by the EU. The extensive liability of the retailer will ensure standards are maintained via back pressure in the supply chain.

There has never been a single suggestion by government that imperial measures will be required. Just that their use won't be banned as the primary measure - as it is now.