European Commission chief Jean-Claude Juncker said on Friday that Britain must do "more work" to clinch a deal by December to move Brexit talks onto the next phase dealing with trade.

"The clock is ticking. I hope that we will be able to come to an agreement as far as the divorce is concerned at the December council (summit) but work has still to be done," Juncker told reporters as he arrived at an EU summit in Gothenburg, Sweden.