Pedestrians walk past British Union flag designs on advertisements.

Software consulting business Casewise has been based in London for 26 years, and has no plans to relocate, Brexit or no.

But CEO Alexandre Wentzo realizes that the company's British homebase could become a problem. He fears that there will be a boycott of "Made in UK" goods by European Union (EU) citizens, similar to Americans boycotting French goods when France did not join the U.S. in the 2003 invasion of Iraq.