The British pound moved lower vis-à-vis the U.S. dollar today as cable tested bids around the US$ 1.6155 level and was capped around the $ 1.6245 level.  Cable reached its lowest level since 13 July.  Bank of England Deputy Governor Bean reported it may take years to assess the efficacy of the central bank's ₤175 billion asset purchasing program on account of transmission lags.  Bean added the impact of the bond purchase program has been moderately encouraging.  Cable offers are cited around the US$ 1.6355 level.  The euro moved higher vis-à-vis the British pound as the single currency tested offers around the ₤0.8820 level and was supported around the ₤0.8770 level.