David Frost, Britain’s chief negotiator for brexit, said in an e-mail statement on Friday after talks with the EU that it was clear that it would not be easy to reach a post brexit trade agreement with the EU. He said the EU insisted that agreements must be reached on fisheries, state aid, and then substantive work in other areas, “making progress unnecessarily difficult.”. “There are other important areas to be addressed, and even if there is a broad understanding among negotiators, there is still a lot of detail,” he said. Time is tight for both sides. “.