Which trade bodies will certify the goods. Who will take legal responsibility if the goods cause death.
If goods need to meet certain standards before being allowed in the country then that's dealt with by the WTO schedule. How do you think this sort of trade currently happens between two countries with no trade deal or with a trade deal which doesn't cover particular goods?
If goods can enter the country but need to pass certain tests before being sold or going into use then that's a matter for the importer to deal with.
Kindly explain in reasonable detail EXACTLY how this will happen.
First, kindly explain exactly how you think it won't?
I have a business selling plastic gnomes. A customer in post no-deal France wants to buy 1,000 of them. I load the truck, make my customs declaration, take them to Dover, queue up for 2 days, spend 2 minutes with Customs at Dover, get the ferry, queue up for 2 hours, spend 3 minutes with Customs at Calais and deliver to the customer in Paris. France has gnomes at last. And all without a trade deal.