Sterling falls as Britain remains at impasse with EU on Brexit

LONDON (Reuters) - Sterling fell 1% on Wednesday as investors' focus shifted back to the possibility of negative interest rates in Britain and on comments from government officials that not much progress had been made in Brexit negotiations.Britain told the European Union on Wednesday it needed to break a fundamental impasse to clinch a Brexit trade deal by the end of the year and said an agreement on fisheries might not be ready by July.Britain's negotiator with the EU, David Frost, also..