Now, while I don't believe everything I read in the Economist any more than I do all that I read in the Register, quoting the relevant paragraph from:
"Amid the world’s most complex divorce, Britain’s diplomats also have another vital task. Through its membership of the EU, Britain is a member of the World Trade Organisation (WTO) and party to free-trade deals with 53 other countries. When it leaves, it will lose all that. So Britain must urgently prepare to rejoin the WTO as an individual country—which, again, requires the consent of every other member."