BRUSSELS/LONDON (Reuters) - European Union and British negotiators said on Friday there had been very little progress in their latest round of talks about a Brexit free trade agreement, with just weeks left to extend a year-end deadline to reach a deal.Both sides, however, avoided the vitriol that has sometimes marked years of the tortuous Brexit talks. They laid out plans to intensify their negotiations and pleaded for political support from their leaders when they assess the situation later in..