Sterling retreats as concern over negative rates lingers

LONDON (Reuters) - Sterling retreated below $1.23 on Wednesday as the dollar regained strength and investors' focus shifted back to the possibility of negative interest rates in Britain.Bank of England Chief Economist Andy Haldane on Tuesday played down the prospect of imminently taking rates into negative territory, saying that "reviewing and doing are different things".But analysts believe that once the talk of negative rates has taken hold in the markets, it would be hard to shift the focus..