DAVOS: Companies are spending millions of dollars to get ready for a British exit from the European Union and, with little idea of what that would look like, are preparing for higher costs and moving their headquarters from Britain. British business is keen to play down the possibility of a ‘Brexit’ after a planned referendum to ease widespread uncertainty — mainly over how long it would take and how it would play out. But with the government giving few hints as to how a possible departure could unfold, companies have begun to direct teams of lawyers and advisers to pore over different scenarios to try to determine where they could hurt the most.