EU's Barnier warns costs of long Brexit delay must be worth it

Any long Brexit delay would pile on economic and political costs for the European Union, the bloc's chief negotiator Michel Barnier said on Tuesday, stressing that these would need to be weighed up carefully against potential benefits.Barnier spoke ahead of an EU leaders' summit on Thursday and Friday where they could decide on postponing Brexit beyond the current date of March 29, should British Prime Minister Theresa May request that.It would extend uncertainty and uncertainty costs.