Business is brisk at Nim's Fruit Crisps. Pineapples are imported from Costa Rica, kiwis from Italy and oranges and lemons from Spain. They're then turned into healthy snacks for export to Israel, South Africa, Hong Kong and elsewhere.

You wouldn't know that the company in southeast England is already about to head into the post-Brexit world without knowing what it will look like.

Nim's will ship goods in coming weeks that are due to arrive at their destination after March 29, the date the U.K. plans to leave the European Union. The country still can't agree on a deal to keep borders open and trade flowing.