Britain has appointed a new Ambassador to the European Union to lead Brexit negotiations, days after his predecessor quit due to concerns about the government's muddled strategy over exiting the economic bloc. <br/><br/>Tim Barrow, who will take charge as the UK's Permanent Representative to the EU next week, is a senior diplomat known as a tough negotiator. He replaces Ivan Rogers, who resigned unexpectedly on Tuesday expressing concerns over a muddled Brexit strategy.