BRUSSELS (Reuters) - There has been some progress in talks on a future trade relationship between Britain and the European Union, but both sides are still far apart on fisheries and state aid for companies, the head of the European Commission said on Saturday. Ursula von der Leyen said on Twitter she agreed in a phone call with British Prime Minister Boris Johnson that negotiating teams on both sides would continue to work hard on a deal next week as time is running out to reach and ratify an agreement before Britain’s transition period ends at the end of this year. “We took stock of the negotiations with UK Prime Minister Boris Johnson today. Some progress has been made, but large differences remain especially on level playing field and fisheries,” von der Leyen said. “Our teams will continue working hard next week. We will remain in close contact in the next days,” she said.