Brexiters have 'absolutely no plans' but there are a number of challenges that the U.K. economy will face through the process, Pascal Lamy former WTO Director General told CNBC at a conference in the south of France.
"I'm convinced it will take a very long time, first because we've got this so-called article 50, which is the sort of disentangling of the U.K. legislation from the EU legislation and that is square one. Once you've done that, and it will take a lot of time then you have to go to square two, which is the new relationship between U.K. and European continent."
Adding that while trade is only a small part of the arrangements it will still be a complex and bumpy ride. The bigger challenge he said is that the U.K. with its 60-65 million consumers, will have to negotiate with a bloc of 450 million consumers.